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

chrome/chrome_tests.gypi

 # Copyright 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 857 matching lines @@
         'browser',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
         'chrome_resources.gyp:packed_extra_resources',
         'chrome_resources.gyp:packed_resources',
         'common/extensions/api/api.gyp:chrome_api',
         'renderer',
         'test/perf/perf_test.gyp:*',
         'test_support_common',
         'test_support_sync_integration',
+        '../apps/common/api/api.gyp:apps_api',
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../base/base.gyp:test_support_base',
         '../components/components.gyp:autofill_content_risk_proto',
         '../components/components.gyp:autofill_content_test_support',
         '../components/components.gyp:dom_distiller_content',
         '../components/components.gyp:dom_distiller_test_support',
         '../components/components.gyp:translate_core_common',
         '../components/components_resources.gyp:components_resources',
         '../components/components_strings.gyp:components_strings',
@@ skipping 2360 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }