Drag and drop cleans up touch sequences from the source window.

ui/events/gestures/gesture_provider_aura_unittest.cc

 // 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/gestures/gesture_provider_aura.h"
 
 #include <memory>
 
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 26 matching lines @@
   base::MessageLoopForUI message_loop_;
 };
 
 TEST_F(GestureProviderAuraTest, IgnoresExtraPressEvents) {
   base::TimeDelta time = ui::EventTimeForNow();
   TouchEvent press1(ET_TOUCH_PRESSED, gfx::Point(10, 10), 0, time);
   EXPECT_TRUE(provider()->OnTouchEvent(&press1));
 
   time += base::TimeDelta::FromMilliseconds(10);
   TouchEvent press2(ET_TOUCH_PRESSED, gfx::Point(30, 40), 0, time);
-  // TODO(tdresser): this redundant press with same id should be
-  // ignored; however, there is at least one case where we need to
-  // allow a touch press from a currently used touch id. See
-  // crbug.com/373125 for details.
-  EXPECT_TRUE(provider()->OnTouchEvent(&press2));
+  EXPECT_FALSE(provider()->OnTouchEvent(&press2));
 }
 
 TEST_F(GestureProviderAuraTest, IgnoresExtraMoveOrReleaseEvents) {
   base::TimeDelta time = ui::EventTimeForNow();
   TouchEvent press1(ET_TOUCH_PRESSED, gfx::Point(10, 10), 0, time);
   EXPECT_TRUE(provider()->OnTouchEvent(&press1));
 
   time += base::TimeDelta::FromMilliseconds(10);
   TouchEvent release1(ET_TOUCH_RELEASED, gfx::Point(30, 40), 0, time);
   EXPECT_TRUE(provider()->OnTouchEvent(&release1));
@@ skipping 53 matching lines @@
   time += base::TimeDelta::FromMilliseconds(10);
   TouchEvent move0_4(ET_TOUCH_MOVED, gfx::Point(), 0, kTouchId0, time, kRadiusX,
                      kRadiusY + 1, kAngle, kForce);
   move0_4.set_location_f(gfx::PointF(70, 75.1f));
   move0_4.set_root_location_f(gfx::PointF(70, 75.1f));
 }
 
 // TODO(jdduke): Test whether event marked as scroll trigger.
 
 }  // namespace ui