Convert ChromeViewHostMsg_UpdatedCacheStats to use mojo.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index d5aef3d4136fcfc77a0cd7b50c11f47d46b4179f..0b89a958a2343fdb04f05486dde0d5903353ae00 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1332,8 +1332,9 @@ void RenderProcessHostImpl::RegisterMojoInterfaces() {
           base::Unretained(
               memory_instrumentation::CoordinatorImpl::GetInstance())));
 
-  GetContentClient()->browser()->ExposeInterfacesToRenderer(registry.get(),
-                                                            this);
+  associated_registry_.reset(new AssociatedInterfaceRegistryImpl());
+  GetContentClient()->browser()->ExposeInterfacesToRenderer(
+      registry.get(), associated_registry_.get(), this);
 
   ServiceManagerConnection* service_manager_connection =
       BrowserContext::GetServiceManagerConnectionFor(browser_context_);
@@ -2088,6 +2089,8 @@ void RenderProcessHostImpl::OnAssociatedInterfaceRequest(
     mojom::RouteProviderAssociatedRequest request;
     request.Bind(std::move(handle));
     route_provider_binding_.Bind(std::move(request));
+  } else if (associated_registry_->CanBindRequest(interface_name)) {

[Ken Rockot(use gerrit already), 2017/04/11 22:20:36]

Optional nit: You could add a binder for RouteProvider to associated_registry_
and get rid of the first branch here.

[nigeltao1, 2017/04/20 05:12:36]

Done, by adding some new code further up in this file
(content/browser/renderer_host/render_process_host_impl.cc). There's a little
bit of C++ trickery wrt overloaded method names, so I'm not 100% confident I've
got it right. PTAL.

+    associated_registry_->BindRequest(interface_name, std::move(handle));
   } else {
     LOG(ERROR) << "Request for unknown Channel-associated interface: "
                << interface_name;