Move the secondary build tree into the engine.

Now, both the DEPS and the custom GN rules for them are in the same repo and
won't need a buildroot sibling patch + roll.

Part of flutter/flutter#67373. Pending landing of the buildroot patch in
flutter/buildroot#781 (the DEPS will be updated before landing and after the
presubs pass).

.gitignore

@@ -130,3 +130,4 @@ app.*.symbols
 
 # Prebuilt binaries.
 /prebuilts/
+/build/secondary/third_party/protobuf

DEPS

@@ -262,7 +262,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '60415e4cb48742a60ba3859d92bbdcb7d14841b0',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '6f31be56e1058997feac2e93ff67fef21ae25eaf',
 
    # Fuchsia compatibility
    #
@@ -325,7 +325,7 @@ deps = {
   'src/third_party/protobuf':
    Var('fuchsia_git') + '/third_party/protobuf' + '@' + Var('dart_libprotobuf_rev'),
 
-  'src/build/secondary/third_party/protobuf':
+  'src/flutter/build/secondary/third_party/protobuf':
    Var('fuchsia_git') + '/protobuf-gn' + '@' + Var('dart_protobuf_gn_rev'),
 
   'src/third_party/dart':

build/secondary/flutter/third_party/glfw/BUILD.gn

@@ -0,0 +1,125 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("glfw_args.gni")
+
+_checkout_dir = "//flutter/third_party/glfw"
+
+config("relative_glfw_headers") {
+  include_dirs = [
+    "$_checkout_dir/include",
+    "$_checkout_dir/include/GLFW",
+  ]
+}
+
+source_set("glfw") {
+  public = [
+    "$_checkout_dir/include/GLFW/glfw3.h",
+    "$_checkout_dir/include/GLFW/glfw3native.h",
+  ]
+
+  sources = [
+    "$_checkout_dir/src/context.c",
+    "$_checkout_dir/src/egl_context.c",
+    "$_checkout_dir/src/init.c",
+    "$_checkout_dir/src/input.c",
+    "$_checkout_dir/src/monitor.c",
+    "$_checkout_dir/src/null_init.c",
+    "$_checkout_dir/src/null_joystick.c",
+    "$_checkout_dir/src/null_joystick.h",
+    "$_checkout_dir/src/null_monitor.c",
+    "$_checkout_dir/src/null_platform.h",
+    "$_checkout_dir/src/null_window.c",
+    "$_checkout_dir/src/osmesa_context.c",
+    "$_checkout_dir/src/platform.c",
+    "$_checkout_dir/src/vulkan.c",
+    "$_checkout_dir/src/window.c",
+  ]
+
+  include_dirs = [ "$_checkout_dir/src" ]
+
+  public_configs = [ ":relative_glfw_headers" ]
+
+  if (is_win) {
+    sources += [
+      "$_checkout_dir/src/wgl_context.c",
+      "$_checkout_dir/src/win32_init.c",
+      "$_checkout_dir/src/win32_joystick.c",
+      "$_checkout_dir/src/win32_joystick.h",
+      "$_checkout_dir/src/win32_module.c",
+      "$_checkout_dir/src/win32_monitor.c",
+      "$_checkout_dir/src/win32_platform.h",
+      "$_checkout_dir/src/win32_thread.c",
+      "$_checkout_dir/src/win32_time.c",
+      "$_checkout_dir/src/win32_window.c",
+    ]
+
+    defines = [ "_GLFW_WIN32" ]
+  } else if (is_linux) {
+    sources += [
+      "$_checkout_dir/src/glx_context.c",
+      "$_checkout_dir/src/linux_joystick.c",
+      "$_checkout_dir/src/linux_joystick.h",
+      "$_checkout_dir/src/posix_module.c",
+      "$_checkout_dir/src/posix_poll.c",
+      "$_checkout_dir/src/posix_poll.h",
+      "$_checkout_dir/src/posix_thread.c",
+      "$_checkout_dir/src/posix_thread.h",
+      "$_checkout_dir/src/posix_time.c",
+      "$_checkout_dir/src/posix_time.h",
+      "$_checkout_dir/src/x11_init.c",
+      "$_checkout_dir/src/x11_monitor.c",
+      "$_checkout_dir/src/x11_platform.h",
+      "$_checkout_dir/src/x11_window.c",
+      "$_checkout_dir/src/xkb_unicode.c",
+      "$_checkout_dir/src/xkb_unicode.h",
+    ]
+
+    defines = [
+      "_GLFW_X11",
+      "_GLFW_HAS_XF86VM",
+    ]
+
+    libs = [
+      "X11",
+      "Xcursor",
+      "Xinerama",
+      "Xrandr",
+      "Xxf86vm",
+    ]
+  } else if (is_mac) {
+    sources += [
+      "$_checkout_dir/src/cocoa_init.m",
+      "$_checkout_dir/src/cocoa_joystick.h",
+      "$_checkout_dir/src/cocoa_joystick.m",
+      "$_checkout_dir/src/cocoa_monitor.m",
+      "$_checkout_dir/src/cocoa_platform.h",
+      "$_checkout_dir/src/cocoa_time.c",
+      "$_checkout_dir/src/cocoa_window.m",
+      "$_checkout_dir/src/nsgl_context.m",
+      "$_checkout_dir/src/posix_module.c",
+      "$_checkout_dir/src/posix_thread.c",
+      "$_checkout_dir/src/posix_thread.h",
+    ]
+
+    defines = [ "_GLFW_COCOA" ]
+
+    cflags = [
+      "-Wno-deprecated-declarations",
+      "-Wno-objc-multiple-method-names",
+    ]
+
+    frameworks = [
+      "CoreVideo.framework",
+      "IOKit.framework",
+    ]
+  }
+
+  if (glfw_vulkan_library != "") {
+    defines += [ "_GLFW_VULKAN_LIBRARY=" + glfw_vulkan_library ]
+  }
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+}

build/secondary/flutter/third_party/glfw/README

@@ -0,0 +1,13 @@
+Name: GLFW
+License: zlib/libpng (BSD-like)
+Upstream Git: https://github.com/glfw/glfw
+Version: 3.2.1
+Description:
+
+GLFW is an Open Source, multi-platform library for OpenGL, OpenGL ES and
+Vulkan development on the desktop.
+
+To update:
+- Advance the pinned hash in DEPS, which should map the repository to
+  //third_party/glfw
+- Update BUILD.gn if necessary for changes.

build/secondary/flutter/third_party/glfw/glfw_args.gni

@@ -0,0 +1,7 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  glfw_vulkan_library = ""
+}

build/secondary/testing/gmock/BUILD.gn

@@ -0,0 +1,50 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+config("gmock_config") {
+  # Gmock headers need to be able to find themselves.
+  include_dirs = [ "include" ]
+}
+
+static_library("gmock") {
+  # TODO http://crbug.com/412064 enable this flag all the time.
+  testonly = !is_component_build
+  sources = [
+    # Sources based on files in r173 of gmock.
+    "include/gmock/gmock-actions.h",
+    "include/gmock/gmock-cardinalities.h",
+    "include/gmock/gmock-generated-actions.h",
+    "include/gmock/gmock-generated-function-mockers.h",
+    "include/gmock/gmock-generated-matchers.h",
+    "include/gmock/gmock-generated-nice-strict.h",
+    "include/gmock/gmock-matchers.h",
+    "include/gmock/gmock-spec-builders.h",
+    "include/gmock/gmock.h",
+    "include/gmock/internal/gmock-generated-internal-utils.h",
+    "include/gmock/internal/gmock-internal-utils.h",
+    "include/gmock/internal/gmock-port.h",
+
+    #"src/gmock-all.cc",  # Not needed by our build.
+    "src/gmock-cardinalities.cc",
+    "src/gmock-internal-utils.cc",
+    "src/gmock-matchers.cc",
+    "src/gmock-spec-builders.cc",
+    "src/gmock.cc",
+  ]
+
+  # This project includes some stuff form gtest's guts.
+  include_dirs = [ "../gtest/include" ]
+
+  public_configs = [
+    ":gmock_config",
+    "//testing/gtest:gtest_config",
+  ]
+}
+
+static_library("gmock_main") {
+  # TODO http://crbug.com/412064 enable this flag all the time.
+  testonly = !is_component_build
+  sources = [ "src/gmock_main.cc" ]
+  deps = [ ":gmock" ]
+}

build/secondary/testing/gtest/BUILD.gn

@@ -0,0 +1,132 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+config("gtest_config") {
+  visibility = [
+    ":*",
+    "//testing/gmock:*",  # gmock also shares this config.
+  ]
+
+  defines = [
+    # In order to allow regex matches in gtest to be shared between Windows
+    # and other systems, we tell gtest to always use it's internal engine.
+    "GTEST_HAS_POSIX_RE=0",
+
+    # Chrome doesn't support / require C++11, yet.
+    "GTEST_LANG_CXX11=0",
+  ]
+
+  # Gtest headers need to be able to find themselves.
+  include_dirs = [ "include" ]
+
+  if (is_win) {
+    cflags = [ "/wd4800" ]  # Unused variable warning.
+  }
+
+  if (is_posix) {
+    defines += [
+      # gtest isn't able to figure out when RTTI is disabled for gcc
+      # versions older than 4.3.2, and assumes it's enabled.  Our Mac
+      # and Linux builds disable RTTI, and cannot guarantee that the
+      # compiler will be 4.3.2. or newer.  The Mac, for example, uses
+      # 4.2.1 as that is the latest available on that platform.  gtest
+      # must be instructed that RTTI is disabled here, and for any
+      # direct dependents that might include gtest headers.
+      "GTEST_HAS_RTTI=0",
+    ]
+  }
+
+  if (is_android) {
+    defines += [
+      # We want gtest features that use tr1::tuple, but we currently
+      # don't support the variadic templates used by libstdc++'s
+      # implementation. gtest supports this scenario by providing its
+      # own implementation but we must opt in to it.
+      "GTEST_USE_OWN_TR1_TUPLE=1",
+
+      # GTEST_USE_OWN_TR1_TUPLE only works if GTEST_HAS_TR1_TUPLE is set.
+      # gtest r625 made it so that GTEST_HAS_TR1_TUPLE is set to 0
+      # automatically on android, so it has to be set explicitly here.
+      "GTEST_HAS_TR1_TUPLE=1",
+    ]
+  }
+}
+
+config("gtest_direct_config") {
+  visibility = [ ":*" ]
+  defines = [ "UNIT_TEST" ]
+}
+
+config("gtest_warnings") {
+  visibility = [ ":*" ]
+  if (is_win && is_clang) {
+    # The Mutex constructor initializer list in gtest-port.cc is incorrectly
+    # ordered. See
+    # https://groups.google.com/d/msg/googletestframework/S5uSV8L2TX8/U1FaTDa6J6sJ.
+    cflags = [ "-Wno-reorder" ]
+  }
+}
+
+static_library("gtest") {
+  # TODO http://crbug.com/412064 enable this flag all the time.
+  testonly = !is_component_build
+  sources = [
+    "include/gtest/gtest-death-test.h",
+    "include/gtest/gtest-message.h",
+    "include/gtest/gtest-param-test.h",
+    "include/gtest/gtest-printers.h",
+    "include/gtest/gtest-spi.h",
+    "include/gtest/gtest-test-part.h",
+    "include/gtest/gtest-typed-test.h",
+    "include/gtest/gtest.h",
+    "include/gtest/gtest_pred_impl.h",
+    "include/gtest/internal/gtest-death-test-internal.h",
+    "include/gtest/internal/gtest-filepath.h",
+    "include/gtest/internal/gtest-internal.h",
+    "include/gtest/internal/gtest-linked_ptr.h",
+    "include/gtest/internal/gtest-param-util-generated.h",
+    "include/gtest/internal/gtest-param-util.h",
+    "include/gtest/internal/gtest-port.h",
+    "include/gtest/internal/gtest-string.h",
+    "include/gtest/internal/gtest-tuple.h",
+    "include/gtest/internal/gtest-type-util.h",
+
+    #"gtest/src/gtest-all.cc",  # Not needed by our build.
+    "../multiprocess_func_list.cc",
+    "../multiprocess_func_list.h",
+    "../platform_test.h",
+    "src/gtest-death-test.cc",
+    "src/gtest-filepath.cc",
+    "src/gtest-internal-inl.h",
+    "src/gtest-port.cc",
+    "src/gtest-printers.cc",
+    "src/gtest-test-part.cc",
+    "src/gtest-typed-test.cc",
+    "src/gtest.cc",
+  ]
+
+  if (is_mac) {
+    sources += [
+      "../gtest_mac.h",
+      "../gtest_mac.mm",
+      "../platform_test_mac.mm",
+    ]
+  }
+
+  include_dirs = [ "." ]
+
+  all_dependent_configs = [ ":gtest_config" ]
+  public_configs = [ ":gtest_direct_config" ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  configs += [ ":gtest_warnings" ]
+}
+
+source_set("gtest_main") {
+  # TODO http://crbug.com/412064 enable this flag all the time.
+  testonly = !is_component_build
+  sources = [ "src/gtest_main.cc" ]
+  deps = [ ":gtest" ]
+}

build/secondary/testing/libfuzzer/fuzzer_test.gni

@@ -0,0 +1,11 @@
+# Copyright 2019 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This is a dummy implementation to satisfy the ANGLE build, using the no-op
+# implementation from the real (Chromium) fuzzer_test.gni.
+template("fuzzer_test") {
+  not_needed(invoker, "*")
+  group(target_name) {
+  }
+}

build/secondary/testing/test.gni

@@ -0,0 +1,6 @@
+# Copyright 2019 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This is a dummy file to satisfy the ANGLE build. Flutter's use of ANGLE
+# doesn't actually require any of the real content.

build/secondary/third_party/BUILD.gn

@@ -0,0 +1,9 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("fontconfig") {
+  if (is_linux) {
+    libs = [ "fontconfig" ]
+  }
+}

build/secondary/third_party/android_ndk/BUILD.gn

@@ -0,0 +1,8 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("cpu_features") {
+  public_configs = [ "//third_party/android_tools:cpu_features_include" ]
+  deps = [ "//third_party/android_tools:cpu_features" ]
+}