Synthetic pinch gesture take scale factor as parameter.

content/common/input/synthetic_pinch_gesture_params.cc

 // 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.
 
 #include "content/common/input/synthetic_pinch_gesture_params.h"
 
 #include "base/logging.h"
 
 namespace content {
 
 SyntheticPinchGestureParams::SyntheticPinchGestureParams()
-    : zoom_in(true),
-      total_num_pixels_covered(100),
+    : scale_factor(1.0f),
       relative_pointer_speed_in_pixels_s(500) {}
 
 SyntheticPinchGestureParams::SyntheticPinchGestureParams(
     const SyntheticPinchGestureParams& other)
     : SyntheticGestureParams(other),
-      zoom_in(other.zoom_in),
-      total_num_pixels_covered(other.total_num_pixels_covered),
+      scale_factor(other.scale_factor),
       anchor(other.anchor),
       relative_pointer_speed_in_pixels_s(
           other.relative_pointer_speed_in_pixels_s) {}
 
 SyntheticPinchGestureParams::~SyntheticPinchGestureParams() {}
 
 SyntheticGestureParams::GestureType
 SyntheticPinchGestureParams::GetGestureType() const {
   return PINCH_GESTURE;
 }
 
 const SyntheticPinchGestureParams* SyntheticPinchGestureParams::Cast(
     const SyntheticGestureParams* gesture_params) {
   DCHECK(gesture_params);
   DCHECK_EQ(PINCH_GESTURE, gesture_params->GetGestureType());
   return static_cast<const SyntheticPinchGestureParams*>(gesture_params);
 }
 
 }  // namespace content