generated_api.h should have its body generated into generated_api.cc

build/json_schema_bundle_compile.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     # When including this gypi, the following variables must be set:
     #   schema_files: an array of json or idl files that comprise the api model.
     #   cc_dir: path to generated files
     #   root_namespace: the C++ namespace that all generated files go under
@@ skipping 13 matching lines @@
         '<(api_gen_dir)/cpp_util.py',
         '<(api_gen_dir)/h_generator.py',
         '<(api_gen_dir)/idl_schema.py',
         '<(api_gen_dir)/json_schema.py',
         '<(api_gen_dir)/model.py',
         '<(api_gen_dir)/util_cc_helper.py',
         '<@(schema_files)',
       ],
       'outputs': [
         '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/generated_api.h',
+        '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/generated_api.cc',
         '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/generated_schemas.h',
         '<(SHARED_INTERMEDIATE_DIR)/<(cc_dir)/generated_schemas.cc',
       ],
       'action': [
         'python',
         '<(api_gen)',
         '--root=<(DEPTH)',
         '--destdir=<(SHARED_INTERMEDIATE_DIR)',
         '--namespace=<(root_namespace)',
         '--generator=cpp-bundle',
         '<@(schema_files)',
       ],
       'message': 'Generating C++ API bundle code',
       'process_outputs_as_sources': 1,
     }
   ],
   'include_dirs': [
     '<(SHARED_INTERMEDIATE_DIR)',
     '<(DEPTH)',
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(SHARED_INTERMEDIATE_DIR)',
     ]
   },
+  'dependencies': [
+    '<(DEPTH)/skia/skia.gyp:skia',

[not at google - send to devlin, 2013/02/10 16:03:44]

why is this change needed?

[Joe Thomas, 2013/02/11 22:58:23]

This is required to solve the header file dependency while compiling
generated_api.cc. Below is the sequence from where the dependency comes from

SkTypes.h:14:26: fatal error: SkUserConfig.h: No such file or directory
./third_party/skia/include/core/SkFixed.h:13:0,
./third_party/skia/include/core/SkScalar.h:13,
./third_party/skia/include/core/SkColor.h:13,
./chrome/browser/extensions/extension_action.h:20,
./chrome/browser/extensions/api/extension_action/extension_action_api.h:10,
./chrome/browser/extensions/api/system_indicator/system_indicator_api.h:8,
out/Debug/obj/gen/chrome/common/extensions/api/generated_api.cc:10:

Same is the case with sync_proto below.

[not at google - send to devlin, 2013/02/11 23:00:42]

Hm, could you add the dependency where this rule is used then?

+    '<(DEPTH)/sync/sync.gyp:sync_proto',
+  ],
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,
 }