Make lost context callback a base::Closure thru the WGC3DProvider.

third_party/WebKit/public/platform/WebGraphicsContext3DProvider.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebGraphicsContext3DProvider_h
 #define WebGraphicsContext3DProvider_h
 
-#include "WebCommon.h"
-
 class GrContext;
 
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
 }
 }
 
 namespace blink {
-
+class WebClosure;
 class WebGraphicsContext3D;
 
 class WebGraphicsContext3DProvider {
 public:
     virtual ~WebGraphicsContext3DProvider() { }
 
     virtual WebGraphicsContext3D* context3d() = 0;
     virtual gpu::gles2::GLES2Interface* contextGL() = 0;
     virtual GrContext* grContext() = 0;
+
+    virtual void setLostContextCallback(WebClosure) = 0;
 };
 
 } // namespace blink
 
 #endif