Reland2: H264 HW encode using MediaFoundation

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 5ea6e73f630275374987e73c104ef4b08aae1896..463647f85fff98dcc66897cb82f4ab8a27749122 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -1739,6 +1739,8 @@
           'include_dirs': [ '..', ],
           'defines': [ 'MF_INITIALIZER_IMPLEMENTATION', ],
           'sources': [
+            'base/win/mf_helpers.cc',
+            'base/win/mf_helpers.h',
             'base/win/mf_initializer_export.h',
             'base/win/mf_initializer.cc',
             'base/win/mf_initializer.h',
@@ -2132,7 +2134,7 @@
         }
       ]
     }],
-    ['chromeos==1 or OS=="mac"', {
+    ['chromeos==1 or OS=="mac" or OS=="win"', {
       'targets': [
         {
           'target_name': 'video_encode_accelerator_unittest',
@@ -2164,6 +2166,11 @@
                 '../third_party/webrtc/common_video/common_video.gyp:common_video',
               ],
             }],
+            ['OS=="win"', {
+              'dependencies': [
+                '../media/media.gyp:mf_initializer',
+              ],
+            }],
             ['use_x11==1', {
               'dependencies': [
                 '../ui/gfx/x/gfx_x11.gyp:gfx_x11',