Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/gl_context_egl.cc

 // Copyright (c) 2012 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 "ui/gl/gl_context_egl.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 139 matching lines @@
   if (!eglMakeCurrent(display_,
                       surface->GetHandle(),
                       surface->GetHandle(),
                       context_)) {
     DVLOG(1) << "eglMakeCurrent failed with error "
              << GetLastEGLErrorString();
     return false;
   }
 
   // Set this as soon as the context is current, since we might call into GL.
-  SetRealGLApi();
+  BindGLApi();
 
   SetCurrent(surface);
   InitializeDynamicBindings();
 
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Could not make current.";
     return false;
   }
 
   surface->OnSetSwapInterval(swap_interval_);
@@ skipping 73 matching lines @@
 
 bool GLContextEGL::WasAllocatedUsingRobustnessExtension() {
   return GLSurfaceEGL::IsCreateContextRobustnessSupported();
 }
 
 GLContextEGL::~GLContextEGL() {
   Destroy();
 }
 
 }  // namespace gl