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

extensions/renderer/guest_view/guest_view_request.cc

 // Copyright 2015 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 "extensions/renderer/guest_view/guest_view_request.h"
 
 #include "components/guest_view/common/guest_view_messages.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
+#include "extensions/common/guest_view/extensions_guest_view_messages.h"
 #include "extensions/renderer/guest_view/guest_view_container.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace extensions {
 
 GuestViewRequest::GuestViewRequest(GuestViewContainer* container,
                                    v8::Local<v8::Function> callback,
                                    v8::Isolate* isolate)
@@ skipping 93 matching lines @@
   if (!container()->render_frame())
     return;
 
   container()->render_frame()->DetachGuest(container()->element_instance_id());
 }
 
 void GuestViewDetachRequest::HandleResponse(const IPC::Message& message) {
   ExecuteCallbackIfAvailable(0 /* argc */, nullptr);
 }
 
+GuestViewAttachIframeRequest::GuestViewAttachIframeRequest(
+    GuestViewContainer* container,
+    int render_frame_routing_id,
+    int guest_instance_id,
+    scoped_ptr<base::DictionaryValue> params,
+    v8::Local<v8::Function> callback,
+    v8::Isolate* isolate)
+    : GuestViewRequest(container, callback, isolate),
+      render_frame_routing_id_(render_frame_routing_id),
+      guest_instance_id_(guest_instance_id),
+      params_(params.Pass()) {
+}
+
+GuestViewAttachIframeRequest::~GuestViewAttachIframeRequest() {
+}
+
+void GuestViewAttachIframeRequest::PerformRequest() {
+  LOG(WARNING)
+      << "GuestViewAttachIframeRequest::PerformRequest, guest_instance_id: "
+      << guest_instance_id_;
+  // Only store callback.
+  DCHECK(container()->render_frame());
+
+  container()->render_frame()->Send(
+      new ExtensionsGuestViewHostMsg_AttachToEmbedderFrame(
+          render_frame_routing_id_, container()->element_instance_id(),
+          guest_instance_id_, *params_));
+}
+
+void GuestViewAttachIframeRequest::HandleResponse(const IPC::Message& message) {
+  ExtensionsGuestViewMsg_GuestReady::Param param;
+  bool message_read_status =
+      ExtensionsGuestViewMsg_GuestReady::Read(&message, &param);

[Fady Samuel, 2015/05/26 16:42:15]

Why is this an ExtensionsGuestViewMsg? 

+  DCHECK(message_read_status);
+
+  ExecuteCallbackIfAvailable(0, nullptr);
+}
+
 }  // namespace extensions