Synthetic pinch gesture take scale factor as parameter.

content/browser/renderer_host/input/synthetic_gesture_target_base.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_BASE_H_
 
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 
@@ skipping 32 matching lines @@
   virtual void DispatchInputEventToPlatform(
     const blink::WebInputEvent& event) OVERRIDE;
 
   virtual void SetNeedsFlush() OVERRIDE;
 
   virtual SyntheticGestureParams::GestureSourceType
       GetDefaultSyntheticGestureSourceType() const OVERRIDE;
 
   virtual base::TimeDelta PointerAssumedStoppedTime() const OVERRIDE;
 
-  virtual int GetTouchSlopInDips() const OVERRIDE;
+  virtual float GetTouchSlopInDips() const OVERRIDE;
+
+  virtual float GetMinScalingSpanInDips() const OVERRIDE;
 
  protected:
   RenderWidgetHostImpl* render_widget_host() const { return host_; }
 
  private:
   bool PointIsWithinContents(int x, int y) const;
 
   RenderWidgetHostImpl* host_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticGestureTargetBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_BASE_H_