Ensure Multi-finger tap generates both GestureScrollBegin and GestureScrollEnd.

ui/aura/gestures/gesture_recognizer_unittest.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 "base/command_line.h"
 #include "base/memory/scoped_vector.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/timer/timer.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 2644 matching lines @@
   // Make sure there is enough delay before the touch is released so that it is
   // recognized as a tap.
   delegate->Reset();
   ui::TouchEvent release1(ui::ET_TOUCH_RELEASED, gfx::Point(101, 201),
                           kTouchId1, tes.LeapForward(50));
 
   DispatchEventUsingWindowDispatcher(&release1);
   EXPECT_FALSE(delegate->tap());
   EXPECT_FALSE(delegate->tap_down());
   EXPECT_FALSE(delegate->tap_cancel());
-  EXPECT_FALSE(delegate->scroll_begin());
+  EXPECT_TRUE(delegate->scroll_begin());
   EXPECT_FALSE(delegate->scroll_update());
   EXPECT_FALSE(delegate->scroll_end());
   EXPECT_TRUE(delegate->two_finger_tap());
 
   // Lift second finger.
   // Make sure there is enough delay before the touch is released so that it is
   // recognized as a tap.
   delegate->Reset();
   ui::TouchEvent release2(ui::ET_TOUCH_RELEASED, gfx::Point(130, 201),
                           kTouchId2, tes.LeapForward(50));
@@ skipping 1414 matching lines @@
     DispatchEventUsingWindowDispatcher(&move3);
     delegate->ReceivedAckPreventDefaulted();
     EXPECT_FALSE(delegate->scroll_begin());
     EXPECT_FALSE(delegate->scroll_update());
     delegate->Reset();
   }
 }
 
 }  // namespace test
 }  // namespace aura