Prepare MimeHanderViewContainer for removing swapped out RenderFrame.

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc

 // Copyright 2014 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/mime_handler_view/mime_handler_view_container.h"
 
 #include <map>
 #include <set>
 
 #include "components/guest_view/common/guest_view_constants.h"
 #include "components/guest_view/common/guest_view_messages.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_constants.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/extensions_guest_view_messages.h"
 #include "gin/arguments.h"
 #include "gin/dictionary.h"
 #include "gin/handle.h"
 #include "gin/interceptor.h"
 #include "gin/object_template_builder.h"
 #include "gin/wrappable.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebRemoteFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace extensions {
 
 namespace {
 
 const char kPostMessageName[] = "postMessage";
 
 // The gin-backed scriptable object which is exposed by the BrowserPlugin for
 // MimeHandlerViewContainer. This currently only implements "postMessage".
@@ skipping 192 matching lines @@
       content::RenderView::FromRoutingID(guest_proxy_routing_id_);
   if (!guest_proxy_render_view)
     return;
   blink::WebFrame* guest_proxy_frame =
       guest_proxy_render_view->GetWebView()->mainFrame();
   if (!guest_proxy_frame)
     return;
 
   v8::Context::Scope context_scope(
       render_frame()->GetWebFrame()->mainWorldScriptContext());
-  v8::Local<v8::Object> guest_proxy_window =
-      guest_proxy_frame->mainWorldScriptContext()->Global();
+
+  // TODO(lazyboy,nasko): The WebLocalFrame branch is not used when running
+  // on top of out-of-process iframes. Remove it once the code is converted.
+  v8::Local<v8::Object> guest_proxy_window;
+  if (guest_proxy_frame->isWebLocalFrame()) {
+    guest_proxy_window =
+        guest_proxy_frame->mainWorldScriptContext()->Global();
+  } else {
+    guest_proxy_window = guest_proxy_frame->toWebRemoteFrame()
+                             ->deprecatedMainWorldScriptContext()
+                             ->Global();
+  }
   gin::Dictionary window_object(isolate, guest_proxy_window);
   v8::Local<v8::Function> post_message;
   if (!window_object.Get(std::string(kPostMessageName), &post_message))
     return;
 
   v8::Local<v8::Value> args[] = {
       message,
       // Post the message to any domain inside the browser plugin. The embedder
       // should already know what is embedded.
       gin::StringToV8(isolate, "*")};
-  guest_proxy_frame->callFunctionEvenIfScriptDisabled(
+  render_frame()->GetWebFrame()->callFunctionEvenIfScriptDisabled(
       post_message.As<v8::Function>(),
       guest_proxy_window,
       arraysize(args),
       args);
 }
 
 void MimeHandlerViewContainer::PostMessageFromValue(
     const base::Value& message) {
   blink::WebFrame* frame = render_frame()->GetWebFrame();
   if (!frame)
@@ skipping 58 matching lines @@
   if (!render_frame())
     return;
 
   render_frame()->Send(
       new ExtensionsGuestViewHostMsg_CreateMimeHandlerViewGuest(
           render_frame()->GetRoutingID(), view_id_, element_instance_id(),
           element_size_));
 }
 
 }  // namespace extensions