Fixed NOTREACHED() bug in touch_exploration_controller.

ui/chromeos/touch_exploration_controller_unittest.cc

Index: ui/chromeos/touch_exploration_controller_unittest.cc
diff --git a/ui/chromeos/touch_exploration_controller_unittest.cc b/ui/chromeos/touch_exploration_controller_unittest.cc
index b00814b1eb6efc7f6d197292016f8956e693d1a7..9962cb1dd1c7a00d8773092730d60ba3104c19e3 100644
--- a/ui/chromeos/touch_exploration_controller_unittest.cc
+++ b/ui/chromeos/touch_exploration_controller_unittest.cc
@@ -752,7 +752,13 @@ TEST_F(TouchExplorationTest, DoubleTapNoTouchExplore) {
   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());