Implement --use-gl=any

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 {
 
 // The GL implementation currently in use.
 enum GLImplementation {
   kGLImplementationNone,
   kGLImplementationDesktopGL,
   kGLImplementationOSMesaGL,
   kGLImplementationEGLGLES2,
-  kGLImplementationMockGL
+  kGLImplementationMockGL,
+  kGLImplementationAny

[alokp, 2011/09/27 15:55:48]

This does not seem right. "use-gl=any" is not an implementation. It is a way to
tell the browser to choose any viable implementation.

[Zhenyao Mo, 2011/09/27 18:01:56]

Done.

 };
 
 #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);
@@ skipping 30 matching lines @@
 
 // Set an additional function that will be called to find GL entry points.
 void SetGLGetProcAddressProc(GLGetProcAddressProc proc);
 
 // Find an entry point in the current GL implementation.
 void* GetGLProcAddress(const char* name);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_IMPLEMENTATION_H_