Added EGL based GLContext....

app/gfx/gl/gl_context.cc

 // Copyright (c) 2009 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.
 
-#include <GL/glew.h>
-
 #include "app/gfx/gl/gl_context.h"
+#include "app/gfx/gl/gl_bindings.h"
+#include "app/gfx/gl/gl_implementation.h"
 #include "base/logging.h"
 
 namespace gfx {
 
-// GLEW initialization is extremely expensive because it looks up
-// hundreds of function pointers. Realistically we are not going to
-// switch between GL implementations on the fly, so for the time being
-// we only do the context-dependent GLEW initialization once.
-bool InitializeGLEW() {
-#if defined(UNIT_TEST)
-  return true;
-#else
-  static bool initialized = false;
-  if (initialized)
-    return true;
-
-  // Initializes context-dependent parts of GLEW.
-  if (glewInit() != GLEW_OK) {
-    LOG(ERROR) << "GLEW failed initialization";
-    return false;
-  }
-
-  // Check to see that we can use the OpenGL vertex attribute APIs
-  // TODO(petersont):  Return false if this check fails, but because some
-  // Intel hardware does not support OpenGL 2.0, yet does support all of the
-  // extensions we require, we only log an error.  A future CL should change
-  // this check to ensure that all of the extension strings we require are
-  // present.
-  if (!GLEW_VERSION_2_0) {
-    DLOG(ERROR) << "GL drivers do not have OpenGL 2.0 functionality.";
-  }
-
-  // Check for necessary extensions.
-  bool extensions_found = true;
-  if (!GLEW_ARB_vertex_buffer_object) {
-    // NOTE: Linux NVidia drivers claim to support OpenGL 2.0 when using
-    // indirect rendering (e.g. remote X), but it is actually lying. The
-    // ARB_vertex_buffer_object functions silently no-op (!) when using
-    // indirect rendering, leading to crashes. Fortunately, in that case, the
-    // driver claims to not support ARB_vertex_buffer_object, so fail in that
-    // case.
-    DLOG(ERROR) << "GL drivers do not support vertex buffer objects.";
-    extensions_found = false;
-  }
-  if (!GLEW_EXT_framebuffer_object) {
-    DLOG(ERROR) << "GL drivers do not support framebuffer objects.";
-    extensions_found = false;
-  }
-  if (!GLEW_VERSION_2_0 && !GLEW_EXT_stencil_two_side) {
-    DLOG(ERROR) << "Two sided stencil extension missing.";
-    extensions_found = false;
-  }
-  if (!GLEW_VERSION_1_4 && !GLEW_EXT_blend_func_separate) {
-    DLOG(ERROR) <<"Separate blend func extension missing.";
-    extensions_found = false;
-  }
-  if (!GLEW_VERSION_2_0 && !GLEW_EXT_blend_equation_separate) {
-    DLOG(ERROR) << "Separate blend function extension missing.";
-    extensions_found = false;
-  }
-  if (!extensions_found)
-    return false;
-
-  initialized = true;
-  return true;
-#endif
-}
-
 bool GLContext::InitializeCommon() {
   if (!MakeCurrent())
     return false;
 
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
   if (glGetError() != GL_NO_ERROR)
     return false;
 
   return true;
 }
 }  // namespace gfx