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

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 717 matching lines @@
 
 void RenderViewHostImpl::RequestFindMatchRects(int current_version) {
   Send(new ViewMsg_FindMatchRects(GetRoutingID(), current_version));
 }
 
 void RenderViewHostImpl::DisableFullscreenEncryptedMediaPlayback() {
   media_player_manager_->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,
     const gfx::Point& screen_pt,
     WebDragOperationsMask operations_allowed,
     int key_modifiers) {
   const int renderer_id = GetProcess()->GetID();
   ChildProcessSecurityPolicyImpl* policy =
       ChildProcessSecurityPolicyImpl::GetInstance();
 
@@ skipping 1182 matching lines @@
   return true;
 }
 
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 }  // namespace content