H264 HW encode using MediaFoundation

media/media_gpu.gypi

 {
   'variables': {
     'use_v4lplugin%': 0,
     'use_v4l2_codec%': 0,
   },
   'defines': [
     'MEDIA_GPU_IMPLEMENTATION'
   ],
   'dependencies': [
     '../base/base.gyp:base',
@@ skipping 306 matching lines @@
           ],
           'process_outputs_as_sources': 1,
           'message': 'Generating libva stubs for dynamic loading',
         },
      ]
     }],
     ['OS=="win"', {
       'dependencies': [
         '../media/media.gyp:media',
         '../media/media.gyp:mf_initializer',
+        '../third_party/libyuv/libyuv.gyp:libyuv',
         '../ui/gl/gl.gyp:gl',
         '../ui/gl/init/gl_init.gyp:gl_init',
       ],
       'link_settings': {
         'libraries': [
            '-ld3d9.lib',
            '-ld3d11.lib',
            '-ldxva2.lib',
            '-lstrmiids.lib',
            '-lmf.lib',
@@ skipping 10 matching lines @@
               'mfplat.dll',
             ],
           },
         },
       },
       'sources': [
         'gpu/dxva_picture_buffer_win.cc',
         'gpu/dxva_picture_buffer_win.h',
         'gpu/dxva_video_decode_accelerator_win.cc',
         'gpu/dxva_video_decode_accelerator_win.h',
+        'gpu/media_foundation_video_encode_accelerator_win.cc',
+        'gpu/media_foundation_video_encode_accelerator_win.h',
       ],
       'include_dirs': [
         '<(DEPTH)/third_party/khronos',
       ],
     }],
     ['OS == "win" and target_arch == "x64"', {
       'msvs_settings': {
         'VCCLCompilerTool': {
           'AdditionalOptions': [
             '/wd4267', # Conversion from 'size_t' to 'type', possible loss of data
           ],
         },
       },
     }],
   ],
 }