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

content/renderer/webgraphicscontext3d_provider_impl.cc

 // Copyright 2014 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 "content/renderer/webgraphicscontext3d_provider_impl.h"
 
 #include "cc/blink/context_provider_web_context.h"
+#include "third_party/WebKit/public/platform/callback/WebClosure.h"
 
 namespace content {
 
 WebGraphicsContext3DProviderImpl::WebGraphicsContext3DProviderImpl(
     scoped_refptr<cc_blink::ContextProviderWebContext> provider)
     : provider_(provider) {
 }
 
 WebGraphicsContext3DProviderImpl::~WebGraphicsContext3DProviderImpl() {}
 
 blink::WebGraphicsContext3D* WebGraphicsContext3DProviderImpl::context3d() {
   return provider_->WebContext3D();
 }
 
 gpu::gles2::GLES2Interface* WebGraphicsContext3DProviderImpl::contextGL() {
   return provider_->ContextGL();
 }
 
 GrContext* WebGraphicsContext3DProviderImpl::grContext() {
   return provider_->GrContext();
 }
 
+void WebGraphicsContext3DProviderImpl::setLostContextCallback(
+    blink::WebClosure c) {
+  provider_->SetLostContextCallback(c.ToBaseClosure());
+}
+
 }  // namespace content