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

apps/apps.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.
 
 {
   'targets': [
     {
       'target_name': 'apps',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       # Since browser and browser_extensions actually depend on each other,
       # we must omit the dependency from browser_extensions to browser.
       # However, this means browser_extensions and browser should more or less
       # have the same dependencies. Once browser_extensions is untangled from
       # browser, then we can clean up these dependencies.
       'dependencies': [
         'browser_extensions',
         'common/extensions/api/api.gyp:chrome_api',
+        '../apps/common/api/api.gyp:apps_api',
         '../skia/skia.gyp:skia',
       ],
       'include_dirs': [
         '<(INTERMEDIATE_DIR)',
         '<(grit_out_dir)',
       ],
       'sources': [
         'app_lifetime_monitor.cc',
         'app_lifetime_monitor.h',
         'app_lifetime_monitor_factory.cc',
@@ skipping 11 matching lines @@
         'app_window_contents.cc',
         'app_window_contents.h',
         'app_window_geometry_cache.cc',
         'app_window_geometry_cache.h',
         'app_window_registry.cc',
         'app_window_registry.h',
         'apps_client.cc',
         'apps_client.h',
         'browser_context_keyed_service_factories.cc',
         'browser_context_keyed_service_factories.h',
+        'browser/api/app_runtime/app_runtime_api.cc',
+        'browser/api/app_runtime/app_runtime_api.h',
+        'browser/file_handler_util.cc',
+        'browser/file_handler_util.h',
         'launcher.cc',
         'launcher.h',
         'metrics_names.h',
         'pref_names.cc',
         'pref_names.h',
         'prefs.cc',
         'prefs.h',
         'saved_files_service.cc',
         'saved_files_service.h',
         'saved_files_service_factory.cc',
@@ skipping 194 matching lines @@
             'test/app_shell_test.cc',
             'test/apps_test_launcher_delegate.cc',
             'test/apps_test_launcher_delegate.h',
             'test/apps_tests_main.cc',
           ],
         },
       ],  # targets
     }],  # chromeos==1 or linux aura or win aura
   ],  # conditions
 }