Split DirectCompositionSurfaceWin into two parts.

ui/gl/scoped_make_current.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/scoped_make_current.h"
 
 #include "base/logging.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_surface.h"
 
@@ skipping 17 matching lines @@
     previous_context_->MakeCurrent(previous_surface_.get());
   } else {
     context_->ReleaseCurrent(surface_.get());
   }
 }
 
 bool ScopedMakeCurrent::Succeeded() const {
   return succeeded_;
 }
 
+ScopedReleaseCurrent::ScopedReleaseCurrent(gl::GLSurface* this_surface) {
+  gl::GLContext* current_context = gl::GLContext::GetCurrent();
+  bool was_current =
+      current_context && current_context->IsCurrent(this_surface);
+  if (was_current) {
+    make_current_.emplace(current_context, this_surface);
+    current_context->ReleaseCurrent(this_surface);
+  }
+}
+
+ScopedReleaseCurrent::~ScopedReleaseCurrent() {}
+
 }  // namespace ui