Allow GLSurface to indicate that it supports a specific extension.

ui/gfx/gl/gl_surface_glx.h

 // Copyright (c) 2011 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 "ui/base/x/x11_util.h"
@@ skipping 34 matching lines @@
   explicit NativeViewGLSurfaceGLX(gfx::PluginWindowHandle window);
   virtual ~NativeViewGLSurfaceGLX();
 
   // Implement GLSurfaceGLX.
   virtual bool Initialize();
   virtual void Destroy();
   virtual bool IsOffscreen();
   virtual bool SwapBuffers();
   virtual gfx::Size GetSize();
   virtual void* GetHandle();
+  virtual std::string GetExtensions();
   virtual void* GetConfig();
-  virtual bool SupportsPostSubBuffer();
   virtual bool PostSubBuffer(int x, int y, int width, int height);
 
  protected:
   NativeViewGLSurfaceGLX();
 
   gfx::PluginWindowHandle window_;
 
  private:
   void* config_;
   DISALLOW_COPY_AND_ASSIGN(NativeViewGLSurfaceGLX);
@@ skipping 17 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_