Provide max gesture bounds and option to ignore touch size during pinch

ui/events/gesture_detection/gesture_provider.h

 // Copyright 2014 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 UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/gesture_detection/gesture_detection_export.h"
@@ skipping 27 matching lines @@
     // enabled, there will always be a delay before a tap event is fired, in
     // order to allow the double tap gesture to occur without firing any tap
     // events.
     bool disable_click_delay;
 
     // If |gesture_begin_end_types_enabled| is true, fire an ET_GESTURE_BEGIN
     // event for every added touch point, and an ET_GESTURE_END event for every
     // removed touch point. Defaults to false.
     bool gesture_begin_end_types_enabled;
 
-    // The minimum size (both length and width, in dips) of the generated
+    // The min and max size (both length and width, in dips) of the generated
     // bounding box for all gesture types. This is useful for touch streams
-    // that may report zero or unreasonably small touch sizes.
-    // Defaults to 0.
+    // that may report zero or unreasonably small or large touch sizes.
+    // Both values default to 0 (disabled).
     float min_gesture_bounds_length;
+    float max_gesture_bounds_length;
   };
 
   GestureProvider(const Config& config, GestureProviderClient* client);
   ~GestureProvider();
 
   // Handle the incoming MotionEvent, returning false if the event could not
   // be handled.
   bool OnTouchEvent(const MotionEvent& event);
 
   // Update whether multi-touch pinch zoom is supported by the platform.
@@ skipping 59 matching lines @@
   bool double_tap_support_for_platform_;
 
   // Keeps track of the current GESTURE_LONG_PRESS event. If a context menu is
   // opened after a GESTURE_LONG_PRESS, this is used to insert a
   // GESTURE_TAP_CANCEL for removing any ::active styling.
   base::TimeTicks current_longpress_time_;
 
   const bool gesture_begin_end_types_enabled_;
 
   const float min_gesture_bounds_length_;
+  const float max_gesture_bounds_length_;
 };
 
 }  //  namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_PROVIDER_H_