Original patch from issue 570048

chrome/browser/tab_contents/tab_contents.h

Index: chrome/browser/tab_contents/tab_contents.h
diff --git a/chrome/browser/tab_contents/tab_contents.h b/chrome/browser/tab_contents/tab_contents.h
index 918b063269c1cfe84a3adf14a5bda06b2bbfcb6a..256b40d14a59f13599cfc223276d9ab02a8d3260 100644
--- a/chrome/browser/tab_contents/tab_contents.h
+++ b/chrome/browser/tab_contents/tab_contents.h
@@ -681,11 +681,19 @@ class TabContents : public PageNavigator,
   // the page title and we know we want to update history.
   void UpdateHistoryPageTitle(const NavigationEntry& entry);
 
+  // Sets the zoom level for this tab. Returns a request id that can
+  // be used to observe the corresponding ZOOM_LEVEL_CHANGED notification.
+  int SetZoomLevel(double zoom_level);
+
   // Gets the zoom level for this tab.
   double GetZoomLevel() const;
 
+  // Sets the zoom percent for this tab. Returns a request id that can
+  // be used to observe the corresponding ZOOM_LEVEL_CHANGED notification.
+  int SetZoomPercent(double zoom_percent);
+
   // Gets the zoom percent for this tab.
-  int GetZoomPercent(bool* enable_increment, bool* enable_decrement);
+  double GetZoomPercent(bool* enable_increment, bool* enable_decrement);
 
   // Shows a fade effect over this tab contents. Repeated calls will be ignored
   // until the fade is canceled. If |animate| is true the fade should animate.