Use platform slop/timeout values for selection handle tap detection

content/browser/renderer_host/input/touch_handle.h

Index: content/browser/renderer_host/input/touch_handle.h
diff --git a/content/browser/renderer_host/input/touch_handle.h b/content/browser/renderer_host/input/touch_handle.h
index c78a5b952a72e8c4f84300b316858424e02c110e..7859febef238ea035e699bd1d253af7eeb022fc1 100644
--- a/content/browser/renderer_host/input/touch_handle.h
+++ b/content/browser/renderer_host/input/touch_handle.h
@@ -49,6 +49,8 @@ class CONTENT_EXPORT TouchHandleClient {
   virtual void OnHandleTapped(const TouchHandle& handle) = 0;
   virtual void SetNeedsAnimate() = 0;
   virtual scoped_ptr<TouchHandleDrawable> CreateDrawable() = 0;
+  virtual base::TimeDelta GetTapTimeout() const = 0;
+  virtual float GetTapSlop() const = 0;
 };
 
 // Responsible for displaying a selection or insertion handle for text
@@ -123,6 +125,7 @@ class CONTENT_EXPORT TouchHandle {
   bool enabled_;
   bool is_visible_;
   bool is_dragging_;
+  bool is_drag_within_tap_region_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchHandle);
 };