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

content/renderer/webgraphicscontext3d_provider_impl.cc

Index: content/renderer/webgraphicscontext3d_provider_impl.cc
diff --git a/content/renderer/webgraphicscontext3d_provider_impl.cc b/content/renderer/webgraphicscontext3d_provider_impl.cc
index 5151e8a1984ffb045573cf282b62a80f49fb0385..28a3327341d0a951d691923b5075eb604423cc51 100644
--- a/content/renderer/webgraphicscontext3d_provider_impl.cc
+++ b/content/renderer/webgraphicscontext3d_provider_impl.cc
@@ -5,6 +5,7 @@
 #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 {
 
@@ -27,4 +28,9 @@ GrContext* WebGraphicsContext3DProviderImpl::grContext() {
   return provider_->GrContext();
 }
 
+void WebGraphicsContext3DProviderImpl::setLostContextCallback(
+    blink::WebClosure c) {
+  provider_->SetLostContextCallback(c.TakeBaseClosure());
+}
+
 }  // namespace content