Verify that a WebGLFramebuffer is bound to its context only.

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 6125 matching lines @@
     return m_maxColorAttachments;
 }
 
 void WebGLRenderingContextBase::setBackDrawBuffer(GLenum buf)
 {
     m_backDrawBuffer = buf;
 }
 
 void WebGLRenderingContextBase::setFramebuffer(GLenum target, WebGLFramebuffer* buffer)
 {
+    RELEASE_ASSERT(!buffer || buffer->context() == this);
     if (buffer)
         buffer->setHasEverBeenBound();
 
     if (target == GL_FRAMEBUFFER || target == GL_DRAW_FRAMEBUFFER) {
         m_framebufferBinding = buffer;
         applyStencilTest();
     }
     drawingBuffer()->setFramebufferBinding(target, objectOrZero(getFramebufferBinding(target)));
 
     if (!buffer) {
@@ skipping 134 matching lines @@
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink