Make touch-based synthetic gesture take touch slop into account.

content/browser/renderer_host/input/synthetic_pinch_gesture.h

Index: content/browser/renderer_host/input/synthetic_pinch_gesture.h
diff --git a/content/browser/renderer_host/input/synthetic_pinch_gesture.h b/content/browser/renderer_host/input/synthetic_pinch_gesture.h
index e8cdebfc6e75e10240f4122bc0f6de0ec232a891..d5c17bcf467c9f657214a65efed2709859252bcb 100644
--- a/content/browser/renderer_host/input/synthetic_pinch_gesture.h
+++ b/content/browser/renderer_host/input/synthetic_pinch_gesture.h
@@ -23,22 +23,36 @@ class CONTENT_EXPORT SyntheticPinchGesture : public SyntheticGesture {
       const base::TimeDelta& interval, SyntheticGestureTarget* target) OVERRIDE;
 
  private:
+  enum GestureState {
+    SETUP,
+    STARTED,
+    MOVING,
+    DONE
+  };
+
+  void ForwardTouchInputEvents(
+      const base::TimeDelta& interval, SyntheticGestureTarget* target);
+
+  void UpdateTouchPoints(base::TimeDelta interval);
+  void PressTouchPoints(SyntheticGestureTarget* target);
+  void MoveTouchPoints(SyntheticGestureTarget* target);
+  void ReleaseTouchPoints(SyntheticGestureTarget* target);
+  void ForwardTouchEvent(SyntheticGestureTarget* target) const;
+
+  void SetupCoordinates(SyntheticGestureTarget* target);
+
+  float GetDeltaForPointer0(const base::TimeDelta& interval) const;
+  float ComputeAbsoluteRemainingDistance() const;
+  bool HasReachedTarget() const;
+
   SyntheticPinchGestureParams params_;
   float current_y_0_;
   float current_y_1_;
   float target_y_0_;
   float target_y_1_;
-  bool started_;
   SyntheticWebTouchEvent touch_event_;
-
-  SyntheticGesture::Result ForwardTouchInputEvents(
-      const base::TimeDelta& interval, SyntheticGestureTarget* target);
-
-  void ForwardTouchEvent(SyntheticGestureTarget* target);
-
-  float GetDeltaForPointer0(const base::TimeDelta& interval) const;
-  float ComputeAbsoluteRemainingDistance() const;
-  bool HasFinished() const;
+  SyntheticGestureParams::GestureSourceType gesture_source_type_;
+  GestureState state_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticPinchGesture);
 };