webgl: optimize webgl.texSubImage2D(video) path.

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index abcb0270fcc2ffdf9b297015bd948b94ab3ad43a..2fbc4a3f9e460164237c68b9348cb9f0d00493b2 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -347,13 +347,13 @@ unsigned WebMediaPlayerMS::videoDecodedByteCount() const {
 
 bool WebMediaPlayerMS::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", "WebMediaPlayerMS:copyVideoTextureToPlatformTexture");
   DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK((params.copyType == CopyVideoTextureParams::FullCopy &&
+          !params.xoffset && !params.yoffset) ||
+         (params.copyType == CopyVideoTextureParams::SubCopy &&
+          !params.internalFormat && !params.type));
 
   scoped_refptr<media::VideoFrame> video_frame = compositor_->GetCurrentFrame();
 
@@ -367,9 +367,15 @@ bool WebMediaPlayerMS::copyVideoTextureToPlatformTexture(
   gpu::gles2::GLES2Interface* const gl =
       static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
           ->GetGLInterface();
+  typedef media::SkCanvasVideoRenderer::CopyFrameSingleTextureParams CopyParams;
   media::SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
-      gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
-      flip_y);
+      gl, video_frame.get(),
+      CopyParams(params.copyType == CopyVideoTextureParams::FullCopy
+                     ? CopyParams::FullCopy
+                     : CopyParams::SubCopy,
+                 params.target, params.texture, params.internalFormat,
+                 params.type, params.level, params.xoffset, params.yoffset,
+                 params.premultiplyAlpha, params.flipY));
   return true;
 }