Fixed NOTREACHED() bug in touch_exploration_controller.

ui/chromeos/touch_exploration_controller_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/chromeos/touch_exploration_controller.h"
 
 #include "base/test/simple_test_tick_clock.h"
 #include "base/time/time.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/test/aura_test_base.h"
@@ skipping 734 matching lines @@
 
   // Double-tap without any previous touch.
   // Touch exploration mode has not been entered, so there is no previous
   // touch exploration event. The double-tap should be discarded, and no events
   // should be generated at all.
   gfx::Point double_tap_location(33, 34);
   generator_->set_current_location(double_tap_location);
   generator_->PressTouch();
   generator_->ReleaseTouch();
   generator_->PressTouch();
+  // Since the state stays in single_tap_released, we need to make sure the
+  // tap timer doesn't fire and set the state to no fingers down (since there
+  // is still a finger down).
+  AdvanceSimulatedTimePastPotentialTapDelay();
+  EXPECT_FALSE(IsInNoFingersDownState());
   generator_->ReleaseTouch();
+  EXPECT_TRUE(IsInNoFingersDownState());
 
   std::vector<ui::LocatedEvent*> captured_events = GetCapturedLocatedEvents();
   ASSERT_EQ(0U, captured_events.size());
 }
 
 // Tapping and releasing with a second finger when in touch exploration mode
 // should send a touch press and released to the location of the last
 // successful touch exploration and return to touch explore.
 TEST_F(TouchExplorationTest, SplitTap) {
   SwitchTouchExplorationMode(true);
@@ skipping 862 matching lines @@
   EXPECT_FALSE(IsInSlideGestureState());
   EXPECT_FALSE(IsInTouchToMouseMode());
 
   AdvanceSimulatedTimePastTapDelay();
   EXPECT_FALSE(IsInGestureInProgressState());
   EXPECT_FALSE(IsInSlideGestureState());
   EXPECT_TRUE(IsInTouchToMouseMode());
 }
 
 }  // namespace ui