Implement the gamepad API in the IPC proxy

content/content_tests.gypi

Index: content/content_tests.gypi
diff --git a/content/content_tests.gypi b/content/content_tests.gypi
index 09bb6b227e6d59cbece85ac8eab18390af768e65..9a8da841041badfe463d2e8067a01c48b9ce6858 100644
--- a/content/content_tests.gypi
+++ b/content/content_tests.gypi
@@ -14,6 +14,10 @@
         'content_browser',
         'content_common',
         '../net/net.gyp:net_test_support',
+        '../ppapi/ppapi_internal.gyp:ppapi_host',
+        '../ppapi/ppapi_internal.gyp:ppapi_proxy',
+        '../ppapi/ppapi_internal.gyp:ppapi_shared',
+        '../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',
         '../skia/skia.gyp:skia',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
@@ -261,6 +265,8 @@
         'browser/download/file_metadata_unittest_linux.cc',
         'browser/download/save_package_unittest.cc',
         'browser/gamepad/gamepad_provider_unittest.cc',
+        'browser/gamepad/gamepad_test_helpers.cc',
+        'browser/gamepad/gamepad_test_helpers.h',
         'browser/geolocation/device_data_provider_unittest.cc',
         'browser/geolocation/geolocation_provider_unittest.cc',
         'browser/geolocation/gps_location_provider_unittest_linux.cc',
@@ -290,6 +296,9 @@
         'browser/renderer_host/media/video_capture_controller_unittest.cc',
         'browser/renderer_host/media/video_capture_host_unittest.cc',
         'browser/renderer_host/media/video_capture_manager_unittest.cc',
+        'browser/renderer_host/pepper/browser_ppapi_host_test.cc',
+        'browser/renderer_host/pepper/browser_ppapi_host_test.h',
+        'browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc',
         'browser/renderer_host/render_view_host_unittest.cc',
         'browser/renderer_host/render_widget_host_unittest.cc',
         'browser/renderer_host/render_widget_host_view_aura_unittest.cc',