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Got reverted due to breaking MSVC build:
https://bugs.chromium.org/p/chromium/issues/detail?id=630335#c2

This CL moves GTEST_FAIL() lines so that they fail at the end of the
function.

Original description ----------------------------------------------

H264 HW encode using MediaFoundation

This CL adds MediaFoundationVideoEncodeAccelerator which enables H264 encode support
using MediaFoundation on Windows 8.1+. Also, it includes a refactor of common
MediaFoundation classes under mf_helpers.*.

Note that, this is the first CL and H264 codec is still behind a flag.

Design Doc(with perf measurements): http://goo.gl/UCnwyA

BUG=590060
TEST= Tested AppRTC loopback with Chrome flag "--enable-webrtc-hw-h264-encoding" and
"--enable-mf-h264-encoding" on https://apprtc.appspot.com/?debug=loopback&vsc=h264
Also, added WIN specific sections at vea_unittests.

TBR=ananta@chromium.org,avi@chromium.org,grt@chromium.org,sandersd@chromium.org,wuchengli@chromium.org
The incremented change is trivial.

Review-Url: https://codereview.chromium.org/2167333002
Cr-Commit-Position: refs/heads/master@{#407049}