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 d7b5686b9f8ec631b0b3de789ef6a6700c85fd1c..c9527ee463da048d4654b2ce1e7da96a33d203b3 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -735,6 +735,26 @@ void RenderViewHostImpl::DisableFullscreenEncryptedMediaPlayback() {
 }
 #endif
 
+#if defined(USE_MOJO)
+void RenderViewHostImpl::SetBrowserWebUIHandle(mojo::ScopedHandle handle) {

[darin (slow to review), 2014/03/21 00:04:52]

why is this method named SetBrowserWebUIHandle whereas all of the others are
just named SetWebUIHandle?

[sky, 2014/03/21 03:19:16]

I failed at keeping this consistent. I went with SetWebUIHandle every where.

+  // 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,