Force a swap on resize to work around Intel driver issues with PostSubBuffer.

ui/gfx/gl/gl_surface_glx.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_GL_GL_SURFACE_GLX_H_
 #define UI_GFX_GL_GL_SURFACE_GLX_H_
 
 #include "ui/gfx/gl/gl_surface.h"
 
 #include "base/compiler_specific.h"
@@ skipping 31 matching lines @@
 
 // A surface used to render to a view.
 class GL_EXPORT NativeViewGLSurfaceGLX : public GLSurfaceGLX {
  public:
   explicit NativeViewGLSurfaceGLX(gfx::AcceleratedWidget window);
   virtual ~NativeViewGLSurfaceGLX();
 
   // Implement GLSurfaceGLX.
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
+  virtual bool Resize(const gfx::Size& size) OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void* GetHandle() OVERRIDE;
   virtual std::string GetExtensions() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
 
  protected:
   NativeViewGLSurfaceGLX();
@@ skipping 23 matching lines @@
  private:
   gfx::Size size_;
   void* config_;
   XID pbuffer_;
   DISALLOW_COPY_AND_ASSIGN(PbufferGLSurfaceGLX);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_GLX_H_