Implement ExtensionView based on out-of-process iframes GuestView.

extensions/renderer/dispatcher.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/dispatcher.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 1579 matching lines @@
     module_system->Require("extensionOptionsAttributes");
 
     guest_view_required = true;
   }
 
   // Require ExtensionView.
   if (context->GetAvailability("extensionViewInternal").is_available()) {
     module_system->Require("extensionView");
     module_system->Require("extensionViewApiMethods");
     module_system->Require("extensionViewAttributes");
+
+    guest_view_required = true;

[lazyboy, 2016/04/12 18:16:31]

Assuming this CL goes in after appview CL, we can entirely remove this variable.

[lfg, 2016/04/13 18:19:31]

Done.

   }
 
   // Require WebView.
   if (context->GetAvailability("webViewInternal").is_available()) {
     module_system->Require("webView");
     module_system->Require("webViewApiMethods");
     module_system->Require("webViewAttributes");
     if (context->GetAvailability("webViewExperimentalInternal")
             .is_available()) {
       module_system->Require("webViewExperimental");
@@ skipping 11 matching lines @@
   // The "guestViewDeny" module must always be loaded last. It registers
   // error-providing custom elements for the GuestView types that are not
   // available, and thus all of those types must have been checked and loaded
   // (or not loaded) beforehand.
   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
     module_system->Require("guestViewDeny");
   }
 }
 
 }  // namespace extensions