Zoom Extension API (work in progress)

chrome/browser/guestview/webview/webview_guest.cc

Index: chrome/browser/guestview/webview/webview_guest.cc
diff --git a/chrome/browser/guestview/webview/webview_guest.cc b/chrome/browser/guestview/webview/webview_guest.cc
index a57a445e5dc99288c4e68244b08519da1159852d..ae725aa089be6bd7b11fcc2335ecfac404218a01 100644
--- a/chrome/browser/guestview/webview/webview_guest.cc
+++ b/chrome/browser/guestview/webview/webview_guest.cc
@@ -16,6 +16,7 @@
 #include "chrome/browser/guestview/guestview_constants.h"
 #include "chrome/browser/guestview/webview/webview_constants.h"
 #include "chrome/browser/guestview/webview/webview_permission_types.h"
+#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "chrome/common/chrome_version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/native_web_keyboard_event.h"
@@ -506,8 +507,10 @@ void WebViewGuest::Observe(int type,
 }
 
 void WebViewGuest::SetZoom(double zoom_factor) {
+  ZoomController* zoom_controller =
+      ZoomController::FromWebContents(guest_web_contents());
   double zoom_level = content::ZoomFactorToZoomLevel(zoom_factor);
-  guest_web_contents()->SetZoomLevel(zoom_level);
+  zoom_controller->SetZoomLevel(zoom_level);
 
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   args->SetDouble(webview::kOldZoomFactor, current_zoom_factor_);