Zoom Extension API (work in progress)

chrome/browser/extensions/api/tabs/tabs_event_router.cc

Index: chrome/browser/extensions/api/tabs/tabs_event_router.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_event_router.cc b/chrome/browser/extensions/api/tabs/tabs_event_router.cc
index edf2fb31aef8055e3fd6dae9e0625f268a2687da..5c7f238ad4540106b52550380bc03e7766674277 100644
--- a/chrome/browser/extensions/api/tabs/tabs_event_router.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_event_router.cc
@@ -554,4 +554,31 @@ void TabsEventRouter::TabPinnedStateChanged(WebContents* contents, int index) {
   }
 }
 
+void TabsEventRouter::OnZoomChangeInitiated(content::WebContents* web_contents,
+                                            double old_zoom_level,
+                                            double new_zoom_level,
+                                            ZoomMode zoom_mode) {
+  DCHECK(web_contents);
+  int tab_id = ExtensionTabUtil::GetTabId(web_contents);
+  if (tab_id < 0)
+    return;
+
+  // Prepare the zoom change information.
+  api::tabs::OnZoomChange::ZoomChangeInfo zoom_change_info;
+  zoom_change_info.tab_id = tab_id;
+  zoom_change_info.old_zoom_factor =
+      content::ZoomLevelToZoomFactor(old_zoom_level);
+  zoom_change_info.new_zoom_factor =
+      content::ZoomLevelToZoomFactor(new_zoom_level);
+  ZoomModeToZoomSettings(zoom_mode,
+                         &zoom_change_info.zoom_settings);
+
+  // Dispatch the |onZoomChange| event.
+  Profile* profile = Profile::FromBrowserContext(
+      web_contents->GetBrowserContext());
+  DispatchEvent(profile, tabs::OnZoomChange::kEventName,
+                api::tabs::OnZoomChange::Create(zoom_change_info),
+                EventRouter::USER_GESTURE_UNKNOWN);
+}
+
 }  // namespace extensions