Fixed bookkeeping bug in management of dimensions of mailbox's texture.

Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 483 matching lines @@
 }
 
 bool DrawingBuffer::resizeFramebuffer(const IntSize& size)
 {
     // resize regular FBO
     m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
 
     m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
     m_context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, m_internalColorFormat, size.width(), size.height(), 0, m_colorFormat, GraphicsContext3D::UNSIGNED_BYTE);
     if (m_lastColorBuffer)
-        m_lastColorBuffer->size = m_size;
+        m_lastColorBuffer->size = size;
 
     m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_colorBuffer, 0);
 
     m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
 
     if (!multisample())
         resizeDepthStencil(size, 0);
     if (m_context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE)
         return false;
 
@@ skipping 237 matching lines @@
 
 void DrawingBuffer::bind()
 {
     if (!m_context)
         return;
 
     m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO ? m_multisampleFBO : m_fbo);
 }
 
 } // namespace WebCore