WebGL: accelerated texImage2D and texSubImage2D for canvas

Source/core/html/HTMLCanvasElement.cpp

Index: Source/core/html/HTMLCanvasElement.cpp
diff --git a/Source/core/html/HTMLCanvasElement.cpp b/Source/core/html/HTMLCanvasElement.cpp
index 398e2314071092d48ecda73f84c3e49c5c430842..00109c56340ec0f9da664742c74b9ffb0edcdae9 100644
--- a/Source/core/html/HTMLCanvasElement.cpp
+++ b/Source/core/html/HTMLCanvasElement.cpp
@@ -679,11 +679,11 @@ void HTMLCanvasElement::ensureUnacceleratedImageBuffer()
     m_didFailToCreateImageBuffer = !m_imageBuffer;
 }
 
-Image* HTMLCanvasElement::copiedImage(SourceDrawingBuffer sourceBuffer) const
+Image* HTMLCanvasElement::copiedImage() const

[dshwang, 2014/11/27 21:31:10]

@junov, now it's fixed, as you mentioned in
https://codereview.chromium.org/758493004/#msg8

[dshwang, 2014/12/08 14:09:24]

I drop this fix because ImageBitmap still use copiedImage(BackBuffer) :'( I'll
fix it in another CL.

 {
     if (!m_copiedImage && buffer()) {
         if (m_context && m_context->is3d())
-            m_context->paintRenderingResultsToCanvas(sourceBuffer);
+            m_context->paintRenderingResultsToCanvas(FrontBuffer);
         m_copiedImage = buffer()->copyImage(CopyBackingStore, Unscaled);
         updateExternallyAllocatedMemory();
     }