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

ui/gl/gl_context_glx.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.
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 
 #include "ui/gl/gl_context_glx.h"
 
@@ skipping 139 matching lines @@
     LOG(ERROR) << "glXMakeCurrent failed in ReleaseCurrent";
 }
 
 bool GLContextGLX::IsCurrent(GLSurface* surface) {
   bool native_context_is_current =
       glXGetCurrentContext() == static_cast<GLXContext>(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 (glXGetCurrentDrawable() !=
         reinterpret_cast<GLXDrawable>(surface->GetHandle())) {
       return false;
     }
   }
@@ skipping 48 matching lines @@
 
 bool GLContextGLX::WasAllocatedUsingRobustnessExtension() {
   return GLSurfaceGLX::IsCreateContextRobustnessSupported();
 }
 
 GLContextGLX::~GLContextGLX() {
   Destroy();
 }
 
 }  // namespace gfx