webgl: optimize webgl.texSubImage2D(video) path.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index 2726552c4e18816ee0ea83d0fe5816fa9f60c524..f07f671e9096b935db701654ab286093fcb18071 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -629,12 +629,12 @@ unsigned WebMediaPlayerImpl::videoDecodedByteCount() const {
 
 bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
     blink::WebGraphicsContext3D* web_graphics_context,
-    unsigned int texture,
-    unsigned int internal_format,
-    unsigned int type,
-    bool premultiply_alpha,
-    bool flip_y) {
+    const CopyVideoTextureParams& params) {
   TRACE_EVENT0("media", "WebMediaPlayerImpl:copyVideoTextureToPlatformTexture");
+  DCHECK((params.copyType == CopyVideoTextureParams::FullCopy &&
+          !params.xoffset && !params.yoffset) ||
+         (params.copyType == CopyVideoTextureParams::SubCopy &&
+          !params.internalFormat && !params.type));
 
   scoped_refptr<VideoFrame> video_frame = GetCurrentFrameFromCompositor();
 
@@ -649,8 +649,13 @@ bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
       static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
           ->GetGLInterface();
   SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
-      gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
-      flip_y);
+      gl, video_frame.get(),
+      {params.copyType == CopyVideoTextureParams::FullCopy

[DaleCurtis, 2015/10/21 18:35:50]

:)

+           ? SkCanvasVideoRenderer::CopyFrameSingleTextureParams::FullCopy
+           : SkCanvasVideoRenderer::CopyFrameSingleTextureParams::SubCopy,
+       params.target, params.texture, params.internalFormat, params.type,
+       params.level, params.xoffset, params.yoffset, params.premultiplyAlpha,
+       params.flipY});
   return true;
 }