Add support for app_shell-only extension APIs

extensions/extensions.gyp

Index: extensions/extensions.gyp
diff --git a/extensions/extensions.gyp b/extensions/extensions.gyp
index 2b866dfaf3ff43943351a5a13323bc31a1ab7625..75ed4cbb92a4a7e4697b7dca4a901d2f56bfa220 100644
--- a/extensions/extensions.gyp
+++ b/extensions/extensions.gyp
@@ -966,6 +966,9 @@
       'dependencies': [
         '../base/base.gyp:base',
         '../components/components.gyp:user_prefs',
+        '../content/content.gyp:content_browser',
+        '../content/content.gyp:content_common',
+        '../content/content_shell_and_tests.gyp:test_support_content',
         '../net/net.gyp:net_test_support',
         '../testing/gtest.gyp:gtest',
         'browser/api/api_registration.gyp:extensions_api_registration',
@@ -986,6 +989,8 @@
         'browser/api/storage/settings_test_util.h',
         'browser/api_test_utils.cc',
         'browser/api_test_utils.h',
+        'browser/api_unittest.cc',
+        'browser/api_unittest.h',
         'browser/extension_error_test_util.cc',
         'browser/extension_error_test_util.h',
         'browser/extensions_test.cc',
@@ -1039,6 +1044,7 @@
         '../ui/strings/ui_strings.gyp:ui_strings',
         'extensions_resources.gyp:extensions_resources',
         'extensions_strings.gyp:extensions_strings',
+        'shell/app_shell_resources.gyp:app_shell_resources',
       ],
       'actions': [
         {
@@ -1051,7 +1057,7 @@
               '<(SHARED_INTERMEDIATE_DIR)/extensions/extensions_browser_resources_100_percent.pak',
               '<(SHARED_INTERMEDIATE_DIR)/extensions/extensions_renderer_resources.pak',
               '<(SHARED_INTERMEDIATE_DIR)/extensions/extensions_resources.pak',
-              '<(SHARED_INTERMEDIATE_DIR)/extensions/extensions_resources.pak',
+              '<(SHARED_INTERMEDIATE_DIR)/extensions/shell/app_shell_resources.pak',
               '<(SHARED_INTERMEDIATE_DIR)/extensions/strings/extensions_strings_en-US.pak',
               '<(SHARED_INTERMEDIATE_DIR)/ui/resources/ui_resources_100_percent.pak',
               '<(SHARED_INTERMEDIATE_DIR)/ui/strings/app_locale_settings_en-US.pak',
@@ -1122,8 +1128,6 @@
         'browser/content_hash_tree_unittest.cc',
         'browser/event_listener_map_unittest.cc',
         'browser/event_router_unittest.cc',
-        'browser/api_unittest.cc',
-        'browser/api_unittest.h',
         'browser/error_map_unittest.cc',
         'browser/extension_icon_image_unittest.cc',
         'browser/extension_pref_value_map_unittest.cc',