Use C bindings to Mojo GL entry points exclusively.

mojo/gpu/gl_context.h

Index: mojo/gpu/gl_context.h
diff --git a/mojo/gpu/gl_context.h b/mojo/gpu/gl_context.h
index d8197a51aafda23c6c8b6091fccd18c381f0b6b2..2ccdaaddafe88014f5109283e8942f4eaa474e8a 100644
--- a/mojo/gpu/gl_context.h
+++ b/mojo/gpu/gl_context.h
@@ -5,23 +5,15 @@
 #ifndef MOJO_GPU_GL_CONTEXT_H_
 #define MOJO_GPU_GL_CONTEXT_H_
 
-#include <MGL/mgl.h>
-
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "mojo/public/c/gpu/MGL/mgl.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 
-namespace gpu {
-namespace gles2 {
-class GLES2Interface;
-}
-}
-
 namespace mojo {
 class CommandBuffer;
 using CommandBufferPtr = InterfacePtr<CommandBuffer>;
-class MojoGLES2Impl;
 class Shell;
 
 class GLContext {
@@ -39,10 +31,9 @@ class GLContext {
       CommandBufferPtr command_buffer);
 
   void MakeCurrent();
+  bool IsCurrent();
   void Destroy();
 
-  gpu::gles2::GLES2Interface* gl() const;
-
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
@@ -54,7 +45,6 @@ class GLContext {
   void OnContextLost();
 
   MGLContext context_;
-  scoped_ptr<MojoGLES2Impl> gl_impl_;
 
   base::ObserverList<Observer> observers_;
   base::WeakPtrFactory<GLContext> weak_factory_;