Split bundle generation steps so that API registration is generated in browser, not common.

chrome/common/extensions/api/BUILD.gn

 # 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.
 
-import("//build/config/features.gni")
 import("//extensions/generated_extensions_api.gni")
+import("schemas.gni")
 
-gypi_values = exec_script(
-    "//build/gypi_to_gn.py",
-    [ rebase_path("api.gyp") ],
-    "scope",
-    [ "api.gyp" ])
-
-# Common sources that are both bundled and compiled.
 # GYP version: chrome/common/extensions/api/api.gyp:chrome_api
 generated_extensions_api("api") {
-  if (is_android) {
-    # Should be eliminated. See crbug.com/305852.
-    sources = gypi_values.android_schema_files
-  } else {
-    sources = gypi_values.main_schema_files
-    if (is_chromeos) {
-      sources += gypi_values.chromeos_schema_files
-      if (is_chrome_branded) {
-        sources += gypi_values.chromeos_branded_schema_files
-      }
-    }
-    if (enable_webrtc) {
-      sources += gypi_values.webrtc_schema_files
-    }
-  }
+  schemas = true
+  bundle = true
+}
 
-  if (!is_android) {
-    uncompiled_sources = gypi_values.main_non_compiled_schema_files
-  }
-
+# GYP version: chrome/browser/extensions/api/api.gyp:chrome_api_registration
+generated_extensions_api("api_registration") {

[Yoyo Zhou, 2014/08/23 01:15:03]

Logically, this target should live in chrome/browser/extensions/api instead of
here, but the sources defined in schemas.gni are treated as paths relative to
the BUILD.gn (not to the include file), so that doesn't work as
straightforwardly. Hopefully it should be enough that this target is separate
from the api target.

   impl_dir = "//chrome/browser/extensions/api"
-  root_namespace = "extensions::api::%(namespace)s"
-  bundle = true
-
-  deps = [
-    # Different APIs include some headers from chrome/common that in turn
-    # include generated headers from these targets.
-    # TODO(brettw) this should be made unnecessary if possible.
-    "//components/metrics/proto",
-
-    "//content/public/browser",
-    "//skia",
-    "//sync",
-  ]
-  if (is_chromeos) {
-    # deps += [ "<(DEPTH)/chrome/chrome.gyp:drive_proto" ]  TODO)GYP)
-  }
+  bundle_registration = true
 }