Changes to content/ to facilitate new zoom extension API

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index d84774fdcc36387d2c332fd439e548dec969559f..5a5e863dc094d3ee2b43d6addd14d6e0c3f12e23 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -18,6 +18,7 @@
 #include "content/public/browser/page_navigator.h"
 #include "content/public/browser/save_page_type.h"
 #include "content/public/browser/web_ui.h"
+#include "content/public/common/page_zoom.h"
 #include "content/public/common/stop_find_action.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ -424,6 +425,9 @@ class WebContents : public PageNavigator,
   virtual void SetClosedByUserGesture(bool value) = 0;
   virtual bool GetClosedByUserGesture() const = 0;
 
+  // Gets the flag indicating whether zooming will have default behavior.
+  virtual ZoomMode GetZoomMode() const = 0;
+
   // Gets the zoom level for this tab.
   virtual double GetZoomLevel() const = 0;
 
@@ -494,9 +498,12 @@ class WebContents : public PageNavigator,
   // removed since we can then embed iframes in different processes.
   virtual bool IsSubframe() const = 0;
 
+  // Sets the flag indicating whether zooming will have default behavior.
+  virtual void SetZoomMode(ZoomMode mode) = 0;
+
   // Sets the zoom level for the current page and all BrowserPluginGuests
-  // within the page.
-  virtual void SetZoomLevel(double level) = 0;
+  // within the page. Returns the zoom_id of the zoom change.
+  virtual int SetZoomLevel(double level) = 0;
 
   // Finds text on a page.
   virtual void Find(int request_id,