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

extensions/renderer/guest_view/guest_view_request.cc

Index: extensions/renderer/guest_view/guest_view_request.cc
diff --git a/extensions/renderer/guest_view/guest_view_request.cc b/extensions/renderer/guest_view/guest_view_request.cc
index 78251d9cdc9b25e04bc53e94b80b4c13e6e8b74b..772b62a383d722973ee5daea508b256719e26464 100644
--- a/extensions/renderer/guest_view/guest_view_request.cc
+++ b/extensions/renderer/guest_view/guest_view_request.cc
@@ -7,6 +7,7 @@
 #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"
@@ -120,4 +121,36 @@ void GuestViewDetachRequest::HandleResponse(const IPC::Message& message) {
   ExecuteCallbackIfAvailable(0 /* argc */, nullptr);
 }
 
+GuestViewAttachIframeRequest::GuestViewAttachIframeRequest(
+    GuestViewContainer* container,
+    int guest_instance_id,
+    v8::Local<v8::Function> callback,
+    v8::Isolate* isolate)
+    : GuestViewRequest(container, callback, isolate),
+      guest_instance_id_(guest_instance_id) {
+}
+
+GuestViewAttachIframeRequest::~GuestViewAttachIframeRequest() {
+}
+
+void GuestViewAttachIframeRequest::PerformRequest() {
+  LOG(WARNING)
+      << "GuestViewAttachIframeRequest::PerformRequest, guest_instance_id: "
+      << guest_instance_id_;
+  // Only store callback.
+  DCHECK(container()->render_frame());
+}
+
+void GuestViewAttachIframeRequest::HandleResponse(const IPC::Message& message) {
+  ExtensionsGuestViewMsg_ContentWindowReady::Param param;
+  bool message_read_status =
+      ExtensionsGuestViewMsg_ContentWindowReady::Read(&message, &param);
+  DCHECK(message_read_status);
+
+  v8::HandleScope handle_scope(isolate());
+  const int argc = 0;
+  scoped_ptr<v8::Handle<v8::Value>[]> argv(new v8::Handle<v8::Value>[argc]);
+  ExecuteCallbackIfAvailable(argc, argv.Pass());
+}
+
 }  // namespace extensions