Zoom Extension API (chrome)

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 68726c4e35bd82268d52207cbb4e22ff821fdd82..bd4d36664b861ff7ac42f3e9473abd1a85a18a1b 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -83,6 +83,7 @@
 #include "chrome/browser/ui/sync/sync_promo_ui.h"
 #include "chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h"
 #include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
+#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
@@ -871,6 +872,13 @@ void ChromeContentBrowserClient::GuestWebContentsCreated(
     return;
   }
 
+  // Create a zoom controller for the guest contents give it access to
+  // GetZoomLevel() and and SetZoomLevel() in WebViewGuest.
+  // TODO(wjmaclean) This currently uses the same HostZoomMap as the browser
+  // context, but we eventually want to isolate the guest contents from zoom
+  // changes outside the guest (e.g. in the main browser), so we should
+  // create a separate HostZoomMap for the guest.
+  ZoomController::CreateForWebContents(guest_web_contents);
   if (opener_web_contents) {
     GuestViewBase* guest = GuestViewBase::FromWebContents(opener_web_contents);
     DCHECK(guest);