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

extensions/browser/guest_view/guest_view_message_filter.cc

Index: extensions/browser/guest_view/guest_view_message_filter.cc
diff --git a/extensions/browser/guest_view/guest_view_message_filter.cc b/extensions/browser/guest_view/guest_view_message_filter.cc
index e7c505c43d41af08114cb94df061653f1201279e..1cac980c1caff3ca686ec4333dc0e73e4dee2bee 100644
--- a/extensions/browser/guest_view/guest_view_message_filter.cc
+++ b/extensions/browser/guest_view/guest_view_message_filter.cc
@@ -11,6 +11,7 @@
 #include "extensions/browser/guest_view/guest_view_manager.h"
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_constants.h"
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
+#include "extensions/browser/guest_view/web_view/web_view_guest.h"
 #include "extensions/common/guest_view/guest_view_messages.h"
 #include "ipc/ipc_message_macros.h"
 
@@ -40,6 +41,7 @@ void GuestViewMessageFilter::OverrideThreadForMessage(
   switch (message.type()) {
     case GuestViewHostMsg_AttachGuest::ID:
     case GuestViewHostMsg_CreateMimeHandlerViewGuest::ID:
+    case GuestViewHostMsg_AttachLocalFrameToGuest::ID:
     case GuestViewHostMsg_ResizeGuest::ID:
       *thread = BrowserThread::UI;
       break;
@@ -60,6 +62,8 @@ bool GuestViewMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(GuestViewHostMsg_AttachGuest, OnAttachGuest)
     IPC_MESSAGE_HANDLER(GuestViewHostMsg_CreateMimeHandlerViewGuest,
                         OnCreateMimeHandlerViewGuest)
+    IPC_MESSAGE_HANDLER(GuestViewHostMsg_AttachLocalFrameToGuest,
+                        OnAttachLocalFrameToGuest)
     IPC_MESSAGE_HANDLER(GuestViewHostMsg_ResizeGuest, OnResizeGuest)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -133,6 +137,29 @@ void GuestViewMessageFilter::OnResizeGuest(int render_frame_id,
   mhvg->SetSize(set_size_params);
 }
 
+void GuestViewMessageFilter::OnAttachLocalFrameToGuest(
+    int embedder_local_render_frame_id,
+    int element_instance_id,
+    int guest_instance_id) {
+  auto guest_manager = GuestViewManager::FromBrowserContext(browser_context_);
+  DCHECK(guest_manager);
+  content::WebContents* guest_web_contents =
+      guest_manager->GetGuestByInstanceIDHack(guest_instance_id);
+  DCHECK(guest_web_contents);
+  auto guest = WebViewGuest::FromWebContents(guest_web_contents);
+  DCHECK(guest);
+  content::WebContents* owner_web_contents = guest->owner_web_contents();
+  DCHECK(owner_web_contents);
+  int render_view_proxy_routing_id =
+      guest_web_contents->AttachLocalFrameToGuest(
+          owner_web_contents, embedder_local_render_frame_id);
+
+  owner_web_contents->GetMainFrame()->Send(
+      new GuestViewMsg_ContentWindowReady(
+         element_instance_id,
+         render_view_proxy_routing_id));
+}
+
 void GuestViewMessageFilter::MimeHandlerViewGuestCreatedCallback(
     int element_instance_id,
     int embedder_render_process_id,