cc: VideoLayerImpl VideoFrame::TEXTURE_YUV_420 support.

cc/layers/video_layer_impl.cc

Index: cc/layers/video_layer_impl.cc
diff --git a/cc/layers/video_layer_impl.cc b/cc/layers/video_layer_impl.cc
index 51719717e6d49698db972ee9c80580348524d490..a6f5942e1a9204110f030557d307784de017c110 100644
--- a/cc/layers/video_layer_impl.cc
+++ b/cc/layers/video_layer_impl.cc
@@ -221,8 +221,7 @@ void VideoLayerImpl::AppendQuads(RenderPass* render_pass,
     }
     case VideoFrameExternalResources::YUV_RESOURCE: {
       DCHECK_GE(frame_resources_.size(), 3u);
-      if (frame_resources_.size() < 3u)
-        break;
+
       YUVVideoDrawQuad::ColorSpace color_space = YUVVideoDrawQuad::REC_601;
       if (frame_->format() == media::VideoFrame::YV12J) {
         color_space = YUVVideoDrawQuad::JPEG;
@@ -231,15 +230,26 @@ void VideoLayerImpl::AppendQuads(RenderPass* render_pass,
       }
 
       const gfx::Size ya_tex_size = coded_size;
-      const gfx::Size uv_tex_size = media::VideoFrame::PlaneSize(
-          frame_->format(), media::VideoFrame::kUPlane, coded_size);
-      DCHECK(uv_tex_size ==
-             media::VideoFrame::PlaneSize(
-                 frame_->format(), media::VideoFrame::kVPlane, coded_size));
-      if (frame_resources_.size() > 3) {
-        DCHECK(ya_tex_size ==
+      gfx::Size uv_tex_size;
+
+      if (frame_->format() == media::VideoFrame::NATIVE_TEXTURE) {
+        DCHECK_EQ(media::VideoFrame::TEXTURE_YUV_420, frame_->texture_format());
+        DCHECK_EQ(3u, frame_resources_.size());  // Alpha is not supported yet.
+        DCHECK(visible_rect.origin().IsOrigin());
+        DCHECK(visible_rect.size() == coded_size);
+        uv_tex_size.SetSize((ya_tex_size.width() + 1) / 2,
+                            (ya_tex_size.height() + 1) / 2);
+      } else {
+        uv_tex_size = media::VideoFrame::PlaneSize(
+            frame_->format(), media::VideoFrame::kUPlane, coded_size);
+        DCHECK(uv_tex_size ==
                media::VideoFrame::PlaneSize(
-                   frame_->format(), media::VideoFrame::kAPlane, coded_size));
+                   frame_->format(), media::VideoFrame::kVPlane, coded_size));
+        DCHECK_IMPLIES(
+            frame_resources_.size() > 3,
+            ya_tex_size ==
+                media::VideoFrame::PlaneSize(
+                    frame_->format(), media::VideoFrame::kAPlane, coded_size));
       }
 
       gfx::RectF tex_coord_rect(