Add thread affinity and ASSERT() for same-thread restriction to WTF::Function

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h

 /*
  * 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 152 matching lines @@
 
     bool paintRenderingResultsToImageData(int&, int&, SourceDrawingBuffer, WTF::ArrayBufferContents&);
 
     int sampleCount() const { return m_sampleCount; }
     bool explicitResolveOfMultisampleData() const { return m_antiAliasingMode == MSAAExplicitResolve; }
 
     // Bind to m_drawFramebufferBinding or m_readFramebufferBinding if it's not 0.
     // Otherwise, bind to the default FBO.
     void restoreFramebufferBindings();
 
-    void addNewMailboxCallback(PassOwnPtr<Closure> closure) { m_newMailboxCallback = std::move(closure); }
+    void addNewMailboxCallback(PassOwnPtr<SameThreadClosure> closure) { m_newMailboxCallback = std::move(closure); }
 
 protected: // For unittests
     DrawingBuffer(
         PassOwnPtr<WebGraphicsContext3D>,
         PassOwnPtr<Extensions3DUtil>,
         bool multisampleExtensionSupported,
         bool discardFramebufferSupported,
         PreserveDrawingBuffer,
         WebGraphicsContext3D::Attributes requestedAttributes);
 
@@ skipping 122 matching lines @@
     bool m_discardFramebufferSupported;
     Platform3DObject m_fbo;
     // DrawingBuffer's output is double-buffered. m_colorBuffer is the back buffer.
     TextureInfo m_colorBuffer;
     struct FrontBufferInfo {
         TextureInfo texInfo;
         WebExternalTextureMailbox mailbox;
     };
     FrontBufferInfo m_frontColorBuffer;
 
-    OwnPtr<Closure> m_newMailboxCallback;
+    OwnPtr<SameThreadClosure> m_newMailboxCallback;
 
     // This is used when the user requests either a depth or stencil buffer.
     Platform3DObject m_depthStencilBuffer;
 
     // For multisampling.
     Platform3DObject m_multisampleFBO;
     Platform3DObject m_multisampleColorBuffer;
 
     // True if our contents have been modified since the last presentation of this buffer.
     bool m_contentsChanged;
@@ skipping 33 matching lines @@
     // used to resize the Canvas.
     SkBitmap m_resizingBitmap;
 
     // Used to flip a bitmap vertically.
     Vector<uint8_t> m_scanline;
 };
 
 } // namespace blink
 
 #endif // DrawingBuffer_h