Make options zoom isolated, match embedder zoom on navigation.

extensions/browser/guest_view/extension_options/extension_options_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/extension_options/extension_options_guest.h"
 
 #include "base/values.h"
 #include "components/crx_file/id_util.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 205 matching lines @@
                                NEW_FOREGROUND_TAB,
                                ui::PAGE_TRANSITION_LINK,
                                false));
   }
   return false;
 }
 
 void ExtensionOptionsGuest::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
-  if (attached() && (params.url.GetOrigin() != options_page_.GetOrigin())) {
-    bad_message::ReceivedBadMessage(web_contents()->GetRenderProcessHost(),
-                                    bad_message::EOG_BAD_ORIGIN);
+  if (attached()) {
+    auto guest_zoom_controller =
+        ui_zoom::ZoomController::FromWebContents(web_contents());
+    guest_zoom_controller->SetZoomMode(
+        ui_zoom::ZoomController::ZOOM_MODE_ISOLATED);
+    SetGuestZoomLevelToMatchEmbedder();
+
+    if (params.url.GetOrigin() != options_page_.GetOrigin()) {
+      bad_message::ReceivedBadMessage(web_contents()->GetRenderProcessHost(),
+                                      bad_message::EOG_BAD_ORIGIN);
+    }
   }
 }
 
 bool ExtensionOptionsGuest::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ExtensionOptionsGuest, message)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void ExtensionOptionsGuest::OnRequest(
     const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(params,
                                            web_contents()->GetRenderViewHost());
 }
 
 }  // namespace extensions