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

content/common/android/view_configuration.h

 // 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.
 
 #ifndef CONTENT_COMMON_ANDROID_VIEW_CONFIGURATION_H_
 #define CONTENT_COMMON_ANDROID_VIEW_CONFIGURATION_H_
 
 #include <jni.h>
 
 namespace content {
 
 // Provides access to Android's ViewConfiguration for gesture-related constants.
 class ViewConfiguration {
  public:
   static int GetDoubleTapTimeoutInMs();
   static int GetLongPressTimeoutInMs();
   static int GetTapTimeoutInMs();
 
   static int GetMaximumFlingVelocityInDipsPerSecond();
   static int GetMinimumFlingVelocityInDipsPerSecond();
 
   static int GetMaximumFlingVelocityInPixelsPerSecond();
   static int GetMinimumFlingVelocityInPixelsPerSecond();
 
+  static int GetTouchSlopInPixels();
+
   // Registers methods with JNI and returns true if succeeded.
   static bool RegisterViewConfiguration(JNIEnv* env);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_ANDROID_VIEW_CONFIGURATION_H_