Android: Use virtualized context only for those with compatible config

ui/gl/gl_surface_osmesa.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_GL_GL_SURFACE_OSMESA_H_
 #define UI_GL_GL_SURFACE_OSMESA_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 15 matching lines @@
   // Implement GLSurface.
   bool Initialize(GLSurface::Format format) override;
   void Destroy() override;
   bool Resize(const gfx::Size& new_size,
               float scale_factor,
               bool has_alpha) override;
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;
   gfx::Size GetSize() override;
   void* GetHandle() override;
-  unsigned GetFormat() override;
 
  protected:
   ~GLSurfaceOSMesa() override;
 
  private:
-  unsigned format_;
   gfx::Size size_;
   scoped_ptr<int32_t[]> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesa);
 };
 
 // A thin subclass of |GLSurfaceOSMesa| that can be used in place
 // of a native hardware-provided surface when a native surface
 // provider is not available.
 class GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
  public:
   explicit GLSurfaceOSMesaHeadless();
 
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;
 
  protected:
   ~GLSurfaceOSMesaHeadless() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesaHeadless);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_OSMESA_H_