Attach YUV420 to RGB converter to GLContext

ui/gl/gl_context.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_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/cancellation_flag.h"
 #include "ui/gl/gl_share_group.h"
 #include "ui/gl/gl_state_restorer.h"
 #include "ui/gl/gpu_preference.h"
 
 namespace gpu {
 class GLContextVirtual;
 }  // namespace gpu
 
 namespace gfx {
 
 class GLSurface;
 class GPUTiming;
 class GPUTimingClient;
 class VirtualGLApi;
+class YUV420RGBConverter;
 struct GLVersionInfo;
 
-
 // Encapsulates an OpenGL context, hiding platform specific management.
 class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
  public:
   explicit GLContext(GLShareGroup* share_group);
 
   // Initializes the GL context to be compatible with the given surface. The GL
   // context can be made with other surface's of the same type. The compatible
   // surface is only needed for certain platforms like WGL, OSMesa and GLX. It
   // should be specific for all platforms though.
   virtual bool Initialize(
@@ skipping 77 matching lines @@
   // Notify this context that |virtual_context|, that was using us, is
   // being released or destroyed.
   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 
   // Returns the GL version string. The context must be current.
   virtual std::string GetGLVersion();
 
   // Returns the GL renderer string. The context must be current.
   virtual std::string GetGLRenderer();
 
+  // Returns a helper structure to convert biplanar YUV 420 IOSurface to RGB
+  // textures.
+  virtual YUV420RGBConverter* GetYUV420RGBConverter();
+
  protected:
   virtual ~GLContext();
 
   // Will release the current context when going out of scope, unless canceled.
   class ScopedReleaseCurrent {
    public:
     ScopedReleaseCurrent();
     ~ScopedReleaseCurrent();
 
     void Cancel();
@@ skipping 46 matching lines @@
   void SetCurrent(GLSurface* surface) override;
 
  private:
   std::unique_ptr<gfx::GPUTiming> gpu_timing_;
   DISALLOW_COPY_AND_ASSIGN(GLContextReal);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_CONTEXT_H_