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..ac2603840e2893adde7758b1d0778b0021f48876 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) {

[Ken Russell (switch to Gerrit), 2016/03/24 18:29:04]

Just to clarify: is the plan eventually to remove WebGraphicsContext3DProvider
entirely?

[danakj, 2016/03/24 18:36:50]

Yeah. Ideally we just use cc::ContextProvider (I think it's moving to
gpu::ContextProvider). If we're not able to do that, we'll either typedef or
continue to wrap it in platform (which is what this is now).

+  provider_->SetLostContextCallback(c.ToBaseClosure());
+}
+
 }  // namespace content