Attach YUV420 to RGB converter to GLContext

ui/gl/gl_context.h

Index: ui/gl/gl_context.h
diff --git a/ui/gl/gl_context.h b/ui/gl/gl_context.h
index 1b4c0406a9a48780681bf910d5b4f67fb04f509e..dfcad5fb2a57ea1da8491d5d9bdd31f15ddc43c6 100644
--- a/ui/gl/gl_context.h
+++ b/ui/gl/gl_context.h
@@ -27,9 +27,9 @@ 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:
@@ -127,6 +127,10 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
   // 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();