Migrate Cloud Print utility messages to Mojo

These are the last remaining legacy IPC messages sent to or from any
utility process.

Bug: 993189
Change-Id: If231f7eaa9986deced8149a9095b31007945ab50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2953763
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#891777}

chrome/common/BUILD.gn

@@ -395,7 +395,7 @@ static_library("common") {
       }
       if (is_win) {
         sources += [
-          "chrome_utility_printing_messages.h",
+          "chrome_utility_printing_param_traits_macros.h",
           "service_process_util_win.cc",
         ]
 
@@ -793,3 +793,25 @@ mojom("offline_page_auto_fetcher_mojom") {
   sources = [ "offline_page_auto_fetcher.mojom" ]
   public_deps = [ "//url/mojom:url_mojom_gurl" ]
 }
+
+if (enable_basic_printing && is_win) {
+  mojom("cloud_print_utility_mojom") {
+    sources = [ "cloud_print_utility.mojom" ]
+    cpp_typemaps = [
+      {
+        types = [
+          {
+            mojom = "chrome.mojom.PrinterCapsAndDefaults"
+            cpp = "::printing::PrinterCapsAndDefaults"
+          },
+          {
+            mojom = "chrome.mojom.PrinterSemanticCapsAndDefaults"
+            cpp = "::printing::PrinterSemanticCapsAndDefaults"
+          },
+        ]
+        traits_headers = [ "chrome_utility_printing_param_traits_macros.h" ]
+        traits_public_deps = [ ":common" ]
+      },
+    ]
+  }
+}

chrome/common/chrome_utility_printing_param_traits_macros.h

@@ -0,0 +1,56 @@
+// 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.
+
+#ifndef CHROME_COMMON_CHROME_UTILITY_PRINTING_PARAM_TRAITS_MACROS_H_
+#define CHROME_COMMON_CHROME_UTILITY_PRINTING_PARAM_TRAITS_MACROS_H_
+
+#include "build/build_config.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_start.h"
+#include "ipc/ipc_param_traits.h"
+#include "printing/backend/print_backend.h"
+#include "printing/buildflags/buildflags.h"
+#include "printing/mojom/print.mojom.h"
+
+#if defined(OS_WIN) && BUILDFLAG(ENABLE_PRINT_PREVIEW)
+// Preview and Cloud Print messages.
+IPC_STRUCT_TRAITS_BEGIN(printing::PrinterCapsAndDefaults)
+  IPC_STRUCT_TRAITS_MEMBER(printer_capabilities)
+  IPC_STRUCT_TRAITS_MEMBER(caps_mime_type)
+  IPC_STRUCT_TRAITS_MEMBER(printer_defaults)
+  IPC_STRUCT_TRAITS_MEMBER(defaults_mime_type)
+IPC_STRUCT_TRAITS_END()
+
+IPC_ENUM_TRAITS_MAX_VALUE(printing::mojom::ColorModel,
+                          printing::mojom::ColorModel::kColorModelLast)
+
+IPC_STRUCT_TRAITS_BEGIN(printing::PrinterSemanticCapsAndDefaults::Paper)
+  IPC_STRUCT_TRAITS_MEMBER(display_name)
+  IPC_STRUCT_TRAITS_MEMBER(vendor_id)
+  IPC_STRUCT_TRAITS_MEMBER(size_um)
+IPC_STRUCT_TRAITS_END()
+
+IPC_ENUM_TRAITS_MIN_MAX_VALUE(printing::mojom::DuplexMode,
+                              printing::mojom::DuplexMode::kUnknownDuplexMode,
+                              printing::mojom::DuplexMode::kShortEdge)
+
+IPC_STRUCT_TRAITS_BEGIN(printing::PrinterSemanticCapsAndDefaults)
+  IPC_STRUCT_TRAITS_MEMBER(collate_capable)
+  IPC_STRUCT_TRAITS_MEMBER(collate_default)
+  IPC_STRUCT_TRAITS_MEMBER(copies_max)
+  IPC_STRUCT_TRAITS_MEMBER(duplex_modes)
+  IPC_STRUCT_TRAITS_MEMBER(duplex_default)
+  IPC_STRUCT_TRAITS_MEMBER(color_changeable)
+  IPC_STRUCT_TRAITS_MEMBER(color_default)
+  IPC_STRUCT_TRAITS_MEMBER(color_model)
+  IPC_STRUCT_TRAITS_MEMBER(bw_model)
+  IPC_STRUCT_TRAITS_MEMBER(papers)
+  IPC_STRUCT_TRAITS_MEMBER(default_paper)
+  IPC_STRUCT_TRAITS_MEMBER(dpis)
+  IPC_STRUCT_TRAITS_MEMBER(default_dpi)
+IPC_STRUCT_TRAITS_END()
+
+#endif  // defined(OS_WIN) && BUILDFLAG(ENABLE_PRINT_PREVIEW)
+
+#endif  // CHROME_COMMON_CHROME_UTILITY_PRINTING_PARAM_TRAITS_MACROS_H_

chrome/common/cloud_print_utility.mojom

@@ -0,0 +1,29 @@
+// Copyright 2021 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.
+
+module chrome.mojom;
+
+// Interface implemented by the unsandboxed Cloud Print utility process (see
+// src/chrome/utility/printing_handler.cc) and called by the Cloud Print service
+// process, which is a special Windows service process run by the deprecated
+// Cloud Print Connector tool. The purpose of the utility process is to isolate
+// printer driver crashes from the service process.
+interface CloudPrintUtility {
+  // Retrieves capabilities and defaults for the specified printer. Returns null
+  // on failure.
+  GetPrinterCapsAndDefaults(string printer_name)
+      => (PrinterCapsAndDefaults? caps_and_defaults);
+
+  // Retrieves capabilities and defaults for the specified printer. Returns null
+  // on failure.
+  GetPrinterSemanticCapsAndDefaults(string printer_name)
+      => (PrinterSemanticCapsAndDefaults? caps_and_defaults);
+};
+
+[Native]
+struct PrinterCapsAndDefaults;
+
+[Native]
+struct PrinterSemanticCapsAndDefaults;
+

chrome/common/common_message_generator.h

@@ -14,11 +14,11 @@
 #include "printing/buildflags/buildflags.h"
 
 #if BUILDFLAG(ENABLE_PRINTING)
-#undef CHROME_COMMON_CHROME_UTILITY_PRINTING_MESSAGES_H_
-#include "chrome/common/chrome_utility_printing_messages.h"
-#ifndef CHROME_COMMON_CHROME_UTILITY_PRINTING_MESSAGES_H_
+#undef CHROME_COMMON_CHROME_UTILITY_PRINTING_PARAM_TRAITS_MACROS_H_
+#include "chrome/common/chrome_utility_printing_param_traits_macros.h"
+#ifndef CHROME_COMMON_CHROME_UTILITY_PRINTING_PARAM_TRAITS_MACROS_H_
 #error \
-    "Failed to include header chrome/common/chrome_utility_printing_messages.h"
+    "Failed to include header chrome/common/chrome_utility_printing_param_traits_macros.h"
 #endif
 #endif
 

chrome/service/BUILD.gn

@@ -95,6 +95,9 @@ static_library("service") {
       "service_utility_process_host.h",
       "service_utility_process_host_receiver_bindings.cc",
     ]
-    deps += [ "//sandbox/win:sandbox" ]
+    deps += [
+      "//chrome/common:cloud_print_utility_mojom",
+      "//sandbox/win:sandbox",
+    ]
   }
 }