Take GL version and extensions correctly into account when binding functions

ui/gl/gl_surface_wgl.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_surface_wgl.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_gl_api_implementation.h"
@@ skipping 146 matching lines @@
 bool GLSurfaceWGL::InitializeOneOff() {
   static bool initialized = false;
   if (initialized)
     return true;
 
   DCHECK(g_display == NULL);
   scoped_ptr<DisplayWGL> wgl_display(new DisplayWGL);
   if (!wgl_display->Init())
     return false;
 
-  // Create a temporary GL context to bind to extension entry points.
+  // Create a temporary GL context to bind to entry points. wglGetProcAddress
+  // is specified to return NULL for all queries if a context is not current in
+  // MSDN documentation, and the static bindings may contain functions that
+  // need to be queried with wglGetProcAddress.
   HGLRC gl_context = wglCreateContext(wgl_display->device_context());
   if (!gl_context) {
     LOG(ERROR) << "Failed to create temporary context.";
     return false;
   }
   if (!wglMakeCurrent(wgl_display->device_context(), gl_context)) {
     LOG(ERROR) << "Failed to make temporary GL context current.";
     wglDeleteContext(gl_context);
     return false;
   }
-  // Get bindings to extension functions that cannot be acquired without a
-  // current context.
-  InitializeGLBindingsGL();
-  InitializeGLBindingsWGL();
+  InitializeStaticGLBindingsGL();
+  InitializeStaticGLBindingsWGL();
 
   wglMakeCurrent(NULL, NULL);
   wglDeleteContext(gl_context);
 
   g_display = wgl_display.release();
   initialized = true;
   return true;
 }
 
 HDC GLSurfaceWGL::GetDisplayDC() {
@@ skipping 167 matching lines @@
 
 gfx::Size PbufferGLSurfaceWGL::GetSize() {
   return size_;
 }
 
 void* PbufferGLSurfaceWGL::GetHandle() {
   return device_context_;
 }
 
 }  // namespace gfx