Add zoom extension API

chrome/browser/extensions/extension_tabs_module.h

Index: chrome/browser/extensions/extension_tabs_module.h
diff --git a/chrome/browser/extensions/extension_tabs_module.h b/chrome/browser/extensions/extension_tabs_module.h
index 71258675631e222a7cb754199ff93b91e51b5c8b..2409aa79012755cda51bc3e43f98c50e07dd3c0e 100644
--- a/chrome/browser/extensions/extension_tabs_module.h
+++ b/chrome/browser/extensions/extension_tabs_module.h
@@ -126,6 +126,26 @@ class RemoveTabFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.remove")
 };
+class SetZoomPercentTabFunction : public AsyncExtensionFunction,
+                                  public NotificationObserver {
+ private:
+  ~SetZoomPercentTabFunction() {}
+  virtual bool RunImpl();
+
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+  NotificationRegistrar registrar_;
+  int tab_id_;
+  int request_id_;
+  DECLARE_EXTENSION_FUNCTION_NAME("tabs.setZoomPercent")
+};
+class GetZoomPercentTabFunction : public SyncExtensionFunction {
+  ~GetZoomPercentTabFunction() {}
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("tabs.getZoomPercent");
+};
+
 class DetectTabLanguageFunction : public AsyncExtensionFunction,
                                   public NotificationObserver {
  private: