Make GestureTextSelector detect its own gestures

ui/events/gesture_detection/scale_gesture_listeners.cc

Index: ui/events/gesture_detection/scale_gesture_listeners.cc
diff --git a/ui/events/gesture_detection/scale_gesture_listeners.cc b/ui/events/gesture_detection/scale_gesture_listeners.cc
new file mode 100644
index 0000000000000000000000000000000000000000..98c957a978f3d18a0d5895dd09f28361f064dfd4
--- /dev/null
+++ b/ui/events/gesture_detection/scale_gesture_listeners.cc
@@ -0,0 +1,23 @@
+// 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.
+
+#include "ui/events/gesture_detection/scale_gesture_listeners.h"
+
+namespace ui {
+
+bool SimpleScaleGestureListener::OnScale(const ScaleGestureDetector&,
+                                         const MotionEvent&) {
+  return false;
+}
+
+bool SimpleScaleGestureListener::OnScaleBegin(const ScaleGestureDetector&,
+                                              const MotionEvent&) {
+  return true;
+}
+
+void SimpleScaleGestureListener::OnScaleEnd(const ScaleGestureDetector&,
+                                            const MotionEvent&) {
+}
+
+}  // namespace ui