Generate response files out of the source tree with xcode & xcode-ninja.

Configure generator_filelist_paths used by main gyp input parse to build
path of "<|()" expansions file names when using "xcode" and "xcode-ninja"
generators to be out of the source tree.

The "xcode" generator will put the files in "xcodebuild/gypfiles" while
the "xcode-ninja" generator will use the same algorithm to generate the
file names as "ninja" generator (but using "gypfiles-xcode-ninja" as
last component of the path).

BUG=chromium:562135
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1477333003 .

pylib/gyp/generator/xcode.py

@@ -87,6 +87,8 @@
   'mac_framework_private_headers',
 ]
 
+generator_filelist_paths = None
+
 # Xcode's standard set of library directories, which don't need to be duplicated
 # in LIBRARY_SEARCH_PATHS. This list is not exhaustive, but that's okay.
 xcode_standard_library_dirs = frozenset([
@@ -578,6 +580,26 @@ def PerformBuild(data, configurations, params):
     subprocess.check_call(arguments)
 
 
+def CalculateGeneratorInputInfo(params):
+  toplevel = params['options'].toplevel_dir
+  if params.get('flavor') == 'ninja':
+    generator_dir = os.path.relpath(params['options'].generator_output or '.')
+    output_dir = params.get('generator_flags', {}).get('output_dir', 'out')
+    output_dir = os.path.normpath(os.path.join(generator_dir, output_dir))
+    qualified_out_dir = os.path.normpath(os.path.join(
+        toplevel, output_dir, 'gypfiles-xcode-ninja'))
+  else:
+    output_dir = os.path.normpath(os.path.join(toplevel, 'xcodebuild'))
+    qualified_out_dir = os.path.normpath(os.path.join(
+        toplevel, output_dir, 'gypfiles'))
+
+    global generator_filelist_paths
+    generator_filelist_paths = {
+        'toplevel': toplevel,
+        'qualified_out_dir': qualified_out_dir,
+    }
+
+
 def GenerateOutput(target_list, target_dicts, data, params):
   # Optionally configure each spec to use ninja as the external builder.
   ninja_wrapper = params.get('flavor') == 'ninja'