Refactor GL bindings so there is no global GLApi or DriverGL.

gpu/command_buffer/service/gl_context_virtual.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 GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_VIRTUAL_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_VIRTUAL_H_
 
 #include <string>
 #include "base/callback_forward.h"
 #include "base/macros.h"
@@ skipping 22 matching lines @@
 
   // Implement GLContext.
   bool Initialize(gl::GLSurface* compatible_surface,
                   const gl::GLContextAttribs& attribs) override;
   bool MakeCurrent(gl::GLSurface* surface) override;
   void ReleaseCurrent(gl::GLSurface* surface) override;
   bool IsCurrent(gl::GLSurface* surface) override;
   void* GetHandle() override;
   scoped_refptr<gl::GPUTimingClient> CreateGPUTimingClient() override;
   void OnSetSwapInterval(int interval) override;
+  std::string GetGLVersion() override;
+  std::string GetGLRenderer() override;
   std::string GetExtensions() override;
   void SetSafeToForceGpuSwitch() override;
   bool WasAllocatedUsingRobustnessExtension() override;
   void SetUnbindFboOnMakeCurrent() override;
   gl::YUVToRGBConverter* GetYUVToRGBConverter() override;
 
  protected:
   ~GLContextVirtual() override;
 
  private:
   void Destroy();
 
   scoped_refptr<gl::GLContext> shared_context_;
   base::WeakPtr<gles2::GLES2Decoder> decoder_;
 
   DISALLOW_COPY_AND_ASSIGN(GLContextVirtual);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_VIRTUAL_H_