Android: Query encoder for supported pixel formats

Test H264VideoEncodeAndValidate would fail on devices that don't
support COLOR_FORMAT_YUV420_SEMIPLANAR. This make it so the test
queries the encoder, and then take the color format from the
returned set.

R=braveyao@chromium.org

Bug: 860559
Change-Id: I524a7e803e9781960a99308834bac4d361e0c442
Reviewed-on: https://chromium-review.googlesource.com/1127469Reviewed-by: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573361}

media/base/android/media_codec_bridge_impl_unittest.cc

@@ -444,12 +444,14 @@ TEST(MediaCodecBridgeTest, H264VideoEncodeAndValidate) {
   const int bit_rate = 300000;
   const int frame_rate = 30;
   const int i_frame_interval = 20;
-  const int color_format = COLOR_FORMAT_YUV420_SEMIPLANAR;
+  const std::set<int> supported_color_formats =
+      MediaCodecUtil::GetEncoderColorFormats("video/avc");
+  ASSERT_TRUE(supported_color_formats.size() != 0);
 
   std::unique_ptr<MediaCodecBridge> media_codec(
       MediaCodecBridgeImpl::CreateVideoEncoder(
           kCodecH264, gfx::Size(width, height), bit_rate, frame_rate,
-          i_frame_interval, color_format));
+          i_frame_interval, *supported_color_formats.begin()));
   ASSERT_THAT(media_codec, NotNull());
 
   const char* src_filename = "bear_320x192_40frames.yuv";