Rebind EGL context to flush driver caches.

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 "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 80 matching lines @@
       LOG(ERROR) << "eglDestroyContext failed with error "
                  << GetLastEGLErrorString();
     }
 
     context_ = nullptr;
   }
 }
 
 bool GLContextEGL::MakeCurrent(GLSurface* surface) {
   DCHECK(context_);
+
+  if (!surface) {
+    ReleaseCurrent(nullptr);
+    return true;
+  }
+
   if (IsCurrent(surface))
       return true;
 
   ScopedReleaseCurrent release_current;
   TRACE_EVENT2("gpu", "GLContextEGL::MakeCurrent",
                "context", context_,
                "surface", surface);
 
   if (unbind_fbo_on_makecurrent_ &&
       eglGetCurrentContext() != EGL_NO_CONTEXT) {
@@ skipping 107 matching lines @@
 
 #if !defined(OS_ANDROID)
 bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
   DCHECK(bytes);
   *bytes = 0;
   return false;
 }
 #endif
 
 }  // namespace gfx