Merge 132980 - Set the initial scissor box for WebGL

Source/WebCore/html/canvas/WebGLRenderingContext.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 514 matching lines @@
         createFallbackBlackTextures1x1();
     if (!isGLES2Compliant())
         initVertexAttrib0();
 
     IntSize canvasSize = clampedCanvasSize();
     if (m_drawingBuffer)
         m_drawingBuffer->reset(canvasSize);
 
     m_context->reshape(canvasSize.width(), canvasSize.height());
     m_context->viewport(0, 0, canvasSize.width(), canvasSize.height());
+    m_context->scissor(0, 0, canvasSize.width(), canvasSize.height());
 
     m_context->setContextLostCallback(adoptPtr(new WebGLRenderingContextLostCallback(this)));
     m_context->setErrorMessageCallback(adoptPtr(new WebGLRenderingContextErrorMessageCallback(this)));
 }
 
 void WebGLRenderingContext::setupFlags()
 {
     ASSERT(m_context);
 
     Page* p = canvas()->document()->page();
@@ skipping 5190 matching lines @@
 
 IntSize WebGLRenderingContext::clampedCanvasSize()
 {
     return IntSize(clamp(canvas()->width(), 1, m_maxViewportDims[0]),
                    clamp(canvas()->height(), 1, m_maxViewportDims[1]));
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEBGL)