Make <webview> use out-of-process iframe architecture.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 933dd38915709fc28af4fe4007645f6302830594..f09251c0234c1db51bfd15c2eec917eca1087b94 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1002,6 +1002,8 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_Navigate, OnNavigate)
     IPC_MESSAGE_HANDLER(FrameMsg_BeforeUnload, OnBeforeUnload)
     IPC_MESSAGE_HANDLER(FrameMsg_SwapOut, OnSwapOut)
+    IPC_MESSAGE_HANDLER(FrameMsg_ReplaceLocalFrameWithProxy,
+                        OnReplaceLocalFrameWithProxy)
     IPC_MESSAGE_HANDLER(FrameMsg_Stop, OnStop)
     IPC_MESSAGE_HANDLER(FrameMsg_ContextMenuClosed, OnContextMenuClosed)
     IPC_MESSAGE_HANDLER(FrameMsg_CustomContextMenuAction,
@@ -1350,6 +1352,19 @@ void RenderFrameImpl::OnSwapOut(
     render_view_->WasSwappedOut();
 }
 
+void RenderFrameImpl::OnReplaceLocalFrameWithProxy(int proxy_routing_id) {
+  RenderFrameProxy* proxy_to_replace_frame = RenderFrameProxy::FromRoutingID(
+      proxy_routing_id);
+  DCHECK(proxy_to_replace_frame);
+
+  blink::WebRemoteFrame* web_frame =
+      blink::WebRemoteFrame::create(proxy_to_replace_frame);

[Charlie Reis, 2015/04/30 23:06:47]

It's not obvious why the existing proxy and swap codepaths aren't sufficient for
this, and it makes me nervous to add another path that we have to reason about.

Can you check with Daniel and Lucas about this?  They've been working on the
swap semantics and would know whether there's a better way to handle this.  (If
there is a good reason for the separate path, we should have comments explaining
it.)

[lazyboy, 2015/05/05 07:28:15]

Using OnSwapOut() now.
Lucas and I checked this bit, so this function is removed.

+  proxy_to_replace_frame->SetWebRemoteFrame(web_frame);
+  proxy_to_replace_frame->web_frame()->initializeFromFrame(frame_);
+  frame_->swap(proxy_to_replace_frame->web_frame());
+  render_view_->RegisterRenderFrameProxy(proxy_to_replace_frame);
+}
+
 void RenderFrameImpl::OnContextMenuClosed(
     const CustomContextMenuContext& custom_context) {
   if (custom_context.request_id) {