Introduce apps API target in //apps and move app.runtime API into it

chrome/common/extensions/api/api.gyp

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'chrome_api',
       'type': 'static_library',
       'sources': [
@@ skipping 20 matching lines @@
           'music_manager_private.idl',
           'principals_private.idl',
           'top_sites.json',
         ],
         'conditions': [
           ['OS!="android"', {
             'schema_files': [
               'activity_log_private.json',
               'alarms.idl',
               'app_current_window_internal.idl',
-              'app_runtime.idl',
               'app_window.idl',
               'audio.idl',
               'automation_internal.idl',
               'automation.idl',
               'autotest_private.idl',
               'bluetooth.idl',
               'bookmark_manager_private.json',
               'bookmarks.json',
               'braille_display_private.idl',
               'cast_channel.idl',
@@ skipping 74 matching lines @@
               'webrtc_logging_private.idl',
               'webstore_private.json',
               'webview.json',
               'windows.json',
             ],
           }, {  # OS=="android"
               'schema_files': [
                 # These should be eliminated. See crbug.com/305852.
                 'activity_log_private.json',
                 'alarms.idl',
-                'app_runtime.idl',
                 'app_window.idl',
                 'context_menus.json',
                 'downloads.idl',
                 'events.json',
                 'feedback_private.idl',
                 'file_system.idl',
                 'manifest_types.json',
                 'omnibox.json',
                 'permissions.json',
                 'runtime.json',
@@ skipping 38 matching lines @@
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '<(DEPTH)/chrome/chrome.gyp:drive_proto',
           ],
         }],
       ],
     },
   ],
 }