Added EGL based GLContext....

app/gfx/gl/gl_implementation.h

+// Copyright (c) 2010 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 APP_GFX_GL_GL_IMPLEMENTATION_H_
+#define APP_GFX_GL_GL_IMPLEMENTATION_H_
+
+namespace gfx {
+
+// The GL implementation currently in use.
+enum GLImplementation {
+  kGLImplementationNone,
+  kGLImplementationDesktopGL,
+  kGLImplementationOSMesaGL,
+  kGLImplementationEGLGLES2,
+  kGLImplementationMockGL
+};
+
+// Initialize a particular GL implementation.
+bool InitializeGLBindings(GLImplementation implementation);
+
+// Get the current GL implementation.
+GLImplementation GetGLImplementation();
+
+// Find an entry point in the current GL implementation.
+void* GetGLProcAddress(const char* name);
+
+}  // namespace gfx
+
+#endif  // APP_GFX_GL_GL_IMPLEMENTATION_H_