Fix imageSourceURL() for WebGL elements.

Source/core/html/canvas/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 500 matching lines @@
     , m_generatedImageCache(4)
     , m_contextLost(false)
     , m_contextLostMode(SyntheticLostContext)
     , m_requestedAttributes(requestedAttributes->clone())
     , m_synthesizedErrorsToConsole(true)
     , m_numGLErrorsToConsoleAllowed(maxGLErrorsAllowedToConsole)
     , m_multisamplingAllowed(false)
     , m_multisamplingObserverRegistered(false)
     , m_onePlusMaxEnabledAttribIndex(0)
     , m_onePlusMaxNonDefaultTextureUnit(0)
+    , m_savingImage(false)
 {
     ASSERT(context);
 
     m_contextGroup = WebGLContextGroup::create();
     m_contextGroup->addContext(this);
 
     m_maxViewportDims[0] = m_maxViewportDims[1] = 0;
     context->getIntegerv(GL_MAX_VIEWPORT_DIMS, m_maxViewportDims);
 
     m_drawingBuffer = createDrawingBuffer(context);
@@ skipping 303 matching lines @@
         canvas()->clearPresentationCopy();
 
     // Until the canvas is written to by the application, the clear that
     // happened after it was composited should be ignored by the compositor.
     if (m_drawingBuffer->layerComposited() && !m_requestedAttributes->preserveDrawingBuffer()) {
         m_drawingBuffer->paintCompositedResultsToCanvas(canvas()->buffer());
 
         canvas()->makePresentationCopy();
     } else
         canvas()->clearPresentationCopy();
+
     clearIfComposited();
 
     if (!m_markedCanvasDirty && !m_layerCleared)
         return;
 
     canvas()->clearCopiedImage();
     m_markedCanvasDirty = false;
 
     ScopedTexture2DRestorer restorer(this);
 
     m_drawingBuffer->commit();
-    if (!(canvas()->buffer())->copyRenderingResultsFromDrawingBuffer(m_drawingBuffer.get())) {
+    if (!(canvas()->buffer())->copyRenderingResultsFromDrawingBuffer(m_drawingBuffer.get(), m_savingImage)) {
         canvas()->ensureUnacceleratedImageBuffer();
         if (canvas()->hasImageBuffer())
             m_drawingBuffer->paintRenderingResultsToCanvas(canvas()->buffer());
     }
 
     if (m_framebufferBinding)
         webContext()->bindFramebuffer(GL_FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
     else
         m_drawingBuffer->bind();
 }
@@ skipping 4819 matching lines @@
         if (m_textureUnits[i].m_texture2DBinding
             || m_textureUnits[i].m_textureCubeMapBinding) {
             m_onePlusMaxNonDefaultTextureUnit = i + 1;
             return;
         }
     }
     m_onePlusMaxNonDefaultTextureUnit = 0;
 }
 
 } // namespace WebCore