Fix DoubleClickInterval and DragThreshold on aura.

views/view_aura.cc

 // Copyright (c) 2011 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 "views/view.h"
 
+namespace {
+
+// Default horizontal drag threshold in pixels.
+// Same as what gtk uses.
+const int kDefaultHorizontalDragThreshold = 8;
+
+// Default vertical drag threshold in pixels.
+// Same as what gtk uses.
+const int kDefaultVerticalDragThreshold = 8;
+
+}  // namespace
+
 namespace views {
 
 gfx::NativeViewAccessible View::GetNativeViewAccessible() {
   return NULL;
 }
 
 int View::GetHorizontalDragThreshold() {
-  return 0;
+  // TODO(jennyz): This value may need to be adjusted for different platforms
+  // and for different display density.
+  return kDefaultHorizontalDragThreshold;
 }
 
 int View::GetVerticalDragThreshold() {
-  return 0;
+  // TODO(jennyz): This value may need to be adjusted for different platforms
+  // and for different display density.
+  return kDefaultVerticalDragThreshold;
 }
 
 }  // namespace views