Split GL binding init into core and extension part

ui/gfx/gl/gl_implementation.h

 // Copyright (c) 2011 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_GFX_GL_GL_IMPLEMENTATION_H_
 #define UI_GFX_GL_GL_IMPLEMENTATION_H_
 #pragma once
 
 #include <string>
 
 #include "base/native_library.h"
 #include "build/build_config.h"
 #include "ui/gfx/gl/gl_export.h"
 #include "ui/gfx/gl/gl_switches.h"
 
 namespace gfx {
 
+class GLContext;
+
 // The GL implementation currently in use.
 enum GLImplementation {
   kGLImplementationNone,
   kGLImplementationDesktopGL,
   kGLImplementationOSMesaGL,
   kGLImplementationEGLGLES2,
   kGLImplementationMockGL
 };
 
 #if defined(OS_WIN)
 typedef void* (WINAPI *GLGetProcAddressProc)(const char* name);
 #else
 typedef void* (*GLGetProcAddressProc)(const char* name);
 #endif
 
 // Initialize a particular GL implementation.
 GL_EXPORT bool InitializeGLBindings(GLImplementation implementation);
 
+// Initialize extension function bindings for a GL implementation.
+GL_EXPORT bool InitializeGLExtensionBindings(GLImplementation implementation,
+    GLContext* context);
+
 // Initialize Debug logging wrappers for GL bindings.
 void InitializeDebugGLBindings();
 
 // Set the current GL implementation.
 void SetGLImplementation(GLImplementation implementation);
 
 // Get the current GL implementation.
 GL_EXPORT GLImplementation GetGLImplementation();
 
 // Does the underlying GL support all features from Desktop GL 2.0 that were
@@ skipping 13 matching lines @@
     const GLImplementation* allowed_implementations_begin,
     const GLImplementation* allowed_implementations_end,
     GLImplementation default_implementation);
 
 // Add a native library to those searched for GL entry points.
 void AddGLNativeLibrary(base::NativeLibrary library);
 
 // Set an additional function that will be called to find GL entry points.
 void SetGLGetProcAddressProc(GLGetProcAddressProc proc);
 
+// Find a core (non-extension) entry point in the current GL implementation. On
+// EGL based implementations core entry points will not be queried through
+// GLGetProcAddressProc.
+void* GetGLCoreProcAddress(const char* name);
+
 // Find an entry point in the current GL implementation.
 void* GetGLProcAddress(const char* name);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_IMPLEMENTATION_H_