Adds plumbing to pass WebUI mojo::Handle from browser to renderer

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 17c6167e9f3096324361df7b5d47d37d9896de3f..e942a281cffce1162c11f819581336d49e3e70a1 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -740,6 +740,26 @@ void RenderViewHostImpl::DisableFullscreenEncryptedMediaPlayback() {
 }
 #endif
 
+#if defined(USE_MOJO)
+void RenderViewHostImpl::SetWebUIHandle(mojo::ScopedMessagePipeHandle handle) {
+  // Never grant any bindings to browser plugin guests.
+  if (GetProcess()->IsGuest()) {
+    NOTREACHED() << "Never grant bindings to a guest process.";
+    return;
+  }
+
+  if ((enabled_bindings_ & BINDINGS_POLICY_WEB_UI) == 0) {
+    NOTREACHED() << "You must grant bindings before setting the handle";
+    return;
+  }
+
+  DCHECK(renderer_initialized_);
+  RenderProcessHostImpl* process =
+      static_cast<RenderProcessHostImpl*>(GetProcess());
+  process->SetWebUIHandle(GetRoutingID(), handle.Pass());
+}
+#endif
+
 void RenderViewHostImpl::DragTargetDragEnter(
     const DropData& drop_data,
     const gfx::Point& client_pt,