Reland https://chromiumcodereview.appspot.com/14286004 which was reverted fue

ui/base/ui_base_switches.cc

Index: ui/base/ui_base_switches.cc
diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index 80fcb0a3c5e160534bed12ad90b284d1e3a41825..5575f27455f7229e4b5b94c8888fd8add2ea9587 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -12,6 +12,12 @@ const char kDisableDwmComposition[] = "disable-dwm-composition";
 // Disables touch adjustment.
 const char kDisableTouchAdjustment[] = "disable-touch-adjustment";
 
+// Disables touch event based drag and drop.
+const char kDisableTouchDragDrop[] = "disable-touch-drag-drop";
+
+// Disables controls that support touch base text editing.
+const char kDisableTouchEditing[] = "disable-touch-editing";
+
 // Disables the Views textfield on Windows.
 const char kDisableViewsTextfield[] = "disable-views-textfield";
 
@@ -21,6 +27,7 @@ const char kEnableBezelTouch[] = "enable-bezel-touch";
 // Enables the new dialog style wherever it is available.
 const char kEnableNewDialogStyle[] = "enable-new-dialog-style";
 
+// Enables touch event based drag and drop.
 const char kEnableTouchDragDrop[] = "enable-touch-drag-drop";
 
 // Enables controls that support touch base text editing.