<webview>: Zooming the embedder should zoom the guest by the same level.

extensions/browser/guest_view/web_view/web_view_guest.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/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 283 matching lines @@
     // lifetime of the new guest is no longer managed by the opener guest.
     GetOpener()->pending_new_windows_.erase(this);
   }
 
   bool allow_transparency = false;
   attach_params()->GetBoolean(webview::kAttributeAllowTransparency,
                               &allow_transparency);
   // We need to set the background opaque flag after navigation to ensure that
   // there is a RenderWidgetHostView available.
   SetAllowTransparency(allow_transparency);
+
+  if (web_view_guest_delegate_)
+    web_view_guest_delegate_->OnDidAttachToEmbedder();
 }
 
 void WebViewGuest::DidInitialize() {
   script_executor_.reset(
       new ScriptExecutor(web_contents(), &script_observers_));
 
   notification_registrar_.Add(this,
                               content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
                               content::Source<WebContents>(web_contents()));
 
@@ skipping 823 matching lines @@
   WebViewGuest* guest =
       WebViewGuest::From(embedder_render_process_id(), new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions