Fix the size of video textures uploaded to WebGL.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 5199 matching lines @@
           IntRect(0, 0, video->videoWidth(), video->videoHeight());
   if (functionID == TexImage2D && sourceImageRectIsDefault && depth == 1 &&
       GL_TEXTURE_2D == target && Extensions3DUtil::canUseCopyTextureCHROMIUM(
                                      target, internalformat, type, level)) {
     DCHECK_EQ(xoffset, 0);
     DCHECK_EQ(yoffset, 0);
     DCHECK_EQ(zoffset, 0);
     // Go through the fast path doing a GPU-GPU textures copy without a readback
     // to system memory if possible.  Otherwise, it will fall back to the normal
     // SW path.
-    if (video->copyVideoTextureToPlatformTexture(
-            contextGL(), texture->object(), internalformat, type,
-            m_unpackPremultiplyAlpha, m_unpackFlipY)) {
+
+    // Note that neither
+    // HTMLVideoElement::copyVideoTextureToPlatformTexture nor
+    // ImageBuffer::copyToPlatformTexture allocate the destination texture
+    // any more.
+    texImage2DBase(target, level, internalformat, video->videoWidth(),
+                   video->videoHeight(), 0, format, type, nullptr);
+
+    if (video->copyVideoTextureToPlatformTexture(contextGL(), texture->object(),
+                                                 m_unpackPremultiplyAlpha,
+                                                 m_unpackFlipY)) {
       return;
     }
 
     // Try using an accelerated image buffer, this allows YUV conversion to be
     // done on the GPU.
     std::unique_ptr<ImageBufferSurface> surface =
         WTF::wrapUnique(new AcceleratedImageBufferSurface(
             IntSize(video->videoWidth(), video->videoHeight())));
     if (surface->isValid()) {
       std::unique_ptr<ImageBuffer> imageBuffer(
           ImageBuffer::create(std::move(surface)));
       if (imageBuffer) {
         // The video element paints an RGBA frame into our surface here. By
         // using an AcceleratedImageBufferSurface, we enable the WebMediaPlayer
         // implementation to do any necessary color space conversion on the GPU
         // (though it may still do a CPU conversion and upload the results).
         video->paintCurrentFrame(
             imageBuffer->canvas(),
             IntRect(0, 0, video->videoWidth(), video->videoHeight()), nullptr);
 
         // This is a straight GPU-GPU copy, any necessary color space conversion
         // was handled in the paintCurrentFrameInContext() call.
 
-        // Note that copyToPlatformTexture no longer allocates the destination
-        // texture.
-        texImage2DBase(target, level, internalformat, video->videoWidth(),
-                       video->videoHeight(), 0, format, type, nullptr);
-
         if (imageBuffer->copyToPlatformTexture(
                 functionIDToSnapshotReason(functionID), contextGL(),
                 texture->object(), internalformat, type, level,
                 m_unpackPremultiplyAlpha, m_unpackFlipY, IntPoint(0, 0),
                 IntRect(0, 0, video->videoWidth(), video->videoHeight()))) {
           return;
         }
       }
     }
   }
@@ skipping 2557 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas())
     result.setHTMLCanvasElement(canvas());
   else
     result.setOffscreenCanvas(offscreenCanvas());
 }
 
 }  // namespace blink