Prepare GuestView for removing swapped out RenderFrame.

extensions/renderer/guest_view/guest_view_internal_custom_bindings.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/guest_view_internal_custom_bindings.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "components/guest_view/common/guest_view_messages.h"
 #include "components/guest_view/renderer/guest_view_request.h"
 #include "components/guest_view/renderer/iframe_guest_view_container.h"
 #include "components/guest_view/renderer/iframe_guest_view_request.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/extensions_guest_view_messages.h"
 #include "extensions/renderer/guest_view/extensions_guest_view_container.h"
 #include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebRemoteFrame.h"
 #include "third_party/WebKit/public/web/WebScopedUserGesture.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "v8/include/v8.h"
 
 using content::V8ValueConverter;
 
 namespace {
 
 // A map from view instance ID to view object (stored via weak V8 reference).
 // Views are registered into this map via
@@ skipping 270 matching lines @@
 
   int view_id = args[0]->Int32Value();
   if (view_id == MSG_ROUTING_NONE)
     return;
 
   content::RenderView* view = content::RenderView::FromRoutingID(view_id);
   if (!view)
     return;
 
   blink::WebFrame* frame = view->GetWebView()->mainFrame();
-  v8::Local<v8::Value> window = frame->mainWorldScriptContext()->Global();
+  v8::Local<v8::Value> window;

[Fady Samuel, 2015/09/14 15:42:46]

nit: comment would be helpful

+  if (frame->isWebLocalFrame()) {
+    window = frame->mainWorldScriptContext()->Global();
+  } else {
+    window =
+        frame->toWebRemoteFrame()->deprecatedMainWorldScriptContext()->Global();
+  }
   args.GetReturnValue().Set(window);
 }
 
 void GuestViewInternalCustomBindings::GetViewFromID(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   // Default to returning null.
   args.GetReturnValue().SetNull();
   // There is one argument.
   CHECK(args.Length() == 1);
   // The view ID.
@@ skipping 92 matching lines @@
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   // Gesture is required to request fullscreen.
   blink::WebScopedUserGesture user_gesture;
   CHECK_EQ(args.Length(), 1);
   CHECK(args[0]->IsFunction());
   v8::Local<v8::Value> no_args;
   context()->CallFunction(v8::Local<v8::Function>::Cast(args[0]), 0, &no_args);
 }
 
 }  // namespace extensions