GPU: Keep track of the last real context and real surface made current.

ui/gl/gl_context_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.
 
 // This file implements the GLContextWGL and PbufferGLContext classes.
 
 #include "ui/gl/gl_context_wgl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 93 matching lines @@
   wglMakeCurrent(NULL, NULL);
 }
 
 bool GLContextWGL::IsCurrent(GLSurface* surface) {
   bool native_context_is_current =
       wglGetCurrentContext() == context_;
 
   // If our context is current then our notion of which GLContext is
   // current must be correct. On the other hand, third-party code
   // using OpenGL might change the current context.
-  DCHECK(!native_context_is_current || (GetCurrent() == this));
+  DCHECK(!native_context_is_current || (GetRealCurrent() == this));
 
   if (!native_context_is_current)
     return false;
 
   if (surface) {
     if (wglGetCurrentDC() != surface->GetHandle())
       return false;
   }
 
   return true;
 }
 
 void* GLContextWGL::GetHandle() {
   return context_;
 }
 
 void GLContextWGL::SetSwapInterval(int interval) {
   DCHECK(IsCurrent(NULL));
   if (gfx::g_driver_wgl.ext.b_WGL_EXT_swap_control) {
     wglSwapIntervalEXT(interval);
   } else {
       LOG(WARNING) <<
           "Could not disable vsync: driver does not "
           "support WGL_EXT_swap_control";
   }
 }
 
 }  // namespace gfx