Add chrome.webstore API methods to allow sites to see progress of installation

chrome/chrome_common.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 143 matching lines @@
         'common/extensions/api/speech/tts_engine_manifest_handler.cc',
         'common/extensions/api/speech/tts_engine_manifest_handler.h',
         'common/extensions/api/spellcheck/spellcheck_handler.cc',
         'common/extensions/api/spellcheck/spellcheck_handler.h',
         'common/extensions/api/storage/storage_schema_manifest_handler.cc',
         'common/extensions/api/storage/storage_schema_manifest_handler.h',
         'common/extensions/api/system_indicator/system_indicator_handler.cc',
         'common/extensions/api/system_indicator/system_indicator_handler.h',
         'common/extensions/api/url_handlers/url_handlers_parser.cc',
         'common/extensions/api/url_handlers/url_handlers_parser.h',
+        'common/extensions/api/webstore/webstore_api_constants.cc',
+        'common/extensions/api/webstore/webstore_api_constants.h',
         'common/extensions/chrome_extension_messages.h',
         'common/extensions/chrome_extensions_client.cc',
         'common/extensions/chrome_extensions_client.h',
         'common/extensions/chrome_manifest_handlers.cc',
         'common/extensions/chrome_manifest_handlers.h',
         'common/extensions/command.cc',
         'common/extensions/command.h',
         'common/extensions/dom_action_types.h',
         'common/extensions/extension_constants.cc',
         'common/extensions/extension_constants.h',
@@ skipping 549 matching lines @@
         'common/metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }