Support for cros touchpad 3-finger click as middle button.

chrome/common/pref_names.cc

 // Copyright (c) 2012 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 "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 434 matching lines @@
 // TODO(derat): This is deprecated in favor of |kAudioVolumePercent|; remove it
 // after R20 once we've cleared old user settings: http://crbug.com/112039
 const char kAudioVolumeDb[] = "settings.audio.volume";
 
 // A double pref storing the user-requested volume.
 const char kAudioVolumePercent[] = "settings.audio.volume_percent";
 
 // A boolean pref set to true if touchpad tap-to-click is enabled.
 const char kTapToClickEnabled[] = "settings.touchpad.enable_tap_to_click";
 
+// A boolean pref set to true if touchpad three-finger-click is enabled.
+const char kEnableTouchpadThreeFingerClick[] =
+    "settings.touchpad.enable_three_finger_click";
+
 // A boolean pref set to true if touchpad natural scrolling is enabled.
 const char kNaturalScroll[] = "settings.touchpad.natural_scroll";
 
 // A boolean pref set to true if primary mouse button is the left button.
 const char kPrimaryMouseButtonRight[] = "settings.mouse.primary_right";
 
 // A integer pref for the touchpad sensitivity.
 const char kMouseSensitivity[] = "settings.mouse.sensitivity2";
 
 // A integer pref for the touchpad sensitivity.
@@ skipping 1374 matching lines @@
 const char kRailBreakProportion[] =
     "gesture.rail_break_proportion";
 const char kRailStartProportion[] =
     "gesture.rail_start_proportion";
 #endif
 
 // Indicates whether the browser is in managed mode.
 const char kInManagedMode[] = "managed_mode";
 
 }  // namespace prefs