Move definitions of GrGL basic types (e.g. GrGLenum) to their own header.

src/gpu/gl/GrGLBufferImpl.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLBufferImpl_DEFINED
 #define GrGLBufferImpl_DEFINED
 
 #include "SkTypes.h"
-#include "gl/GrGLFunctions.h"
+#include "gl/GrGLTypes.h"
 
 class GrGLGpu;
 
 /**
  * This class serves as the implementation of GrGL*Buffer classes. It was written to avoid code
  * duplication in those classes.
  */
 class GrGLBufferImpl : SkNoncopyable {
 public:
     struct Desc {
@@ skipping 28 matching lines @@
     GrGLenum     fBufferType; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER
     void*        fCPUData;
     void*        fMapPtr;
     size_t       fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
                                      // smaller or larger than the size in fDesc.
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif