MediaRecorderHandler and WebmMuxer: add support for H264.

media/muxers/webm_muxer_unittest.cc

Index: media/muxers/webm_muxer_unittest.cc
diff --git a/media/muxers/webm_muxer_unittest.cc b/media/muxers/webm_muxer_unittest.cc
index 03634de8b01d98b6485b45a0a347a0124a52646a..738ed7227e9eeb837a9c9d5b16b899ed6b52b66a 100644
--- a/media/muxers/webm_muxer_unittest.cc
+++ b/media/muxers/webm_muxer_unittest.cc
@@ -243,6 +243,9 @@ const kTestParams kTestCases[] = {
     {kCodecVP9, 1, 0},
     {kCodecVP9, 0, 1},
     {kCodecVP9, 1, 1},
+    {kCodecH264, 1, 0},
+    {kCodecH264, 0, 1},
+    {kCodecH264, 1, 1},

[emircan, 2016/04/25 19:26:16]

Good time to adress TODO:
const VideoCodec kCodecs[] = {kCodecVP8, kCodecVP9, kCodecH264};
testing::Combine(testing::ValuesIn(kCodecs), testing::Values(0, 1),
testing::Values(0, 1))

However, I see you are skipping (0,0). Can that pass automatically? 

[mcasas, 2016/04/26 18:13:38]

I tried for a while but it turned out to be
involved because of the need to skip the (0,0)
case: it hits a DCHECK in Webm ctor [1], so
I'd just leave it like this.

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/media/muxers/webm_...

 };
 
 INSTANTIATE_TEST_CASE_P(, WebmMuxerTest, ValuesIn(kTestCases));