Fix crash which occurs when a widget destroys itself as a result of ET_GESTURE_TAP_DOWN

ash/wm/caption_buttons/frame_maximize_button_unittest.cc

 // Copyright 2013 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 "ash/wm/caption_buttons/frame_maximize_button.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/caption_buttons/frame_caption_button_container_view.h"
@@ skipping 732 matching lines @@
   EXPECT_FALSE(window_state->IsMaximized());
   gfx::Rect new_bounds = widget()->GetWindowBoundsInScreen();
   EXPECT_EQ(new_bounds.x(), initial_bounds.x());
   EXPECT_EQ(new_bounds.y(), initial_bounds.x());
   EXPECT_EQ(new_bounds.width(), initial_bounds.width());
   EXPECT_EQ(new_bounds.height(), initial_bounds.height());
   // Make sure that there is no restore rectangle left.
   EXPECT_FALSE(window_state->HasRestoreBounds());
 }
 
+// Test hovering over the minimize button in the help bubble then tapping the
+// snap left button.
+TEST_F(FrameMaximizeButtonTest, MaximizeBubbleMouseHoverAndTouch) {
+  aura::Window* window = widget()->GetNativeWindow();
+  ash::FrameMaximizeButton* maximize_button =
+      FrameMaximizeButtonTest::maximize_button();
+  maximize_button->set_bubble_appearance_delay_ms(0);
+
+  // Move the mouse cursor over the maximize button to make the help bubble
+  // appear.
+  aura::test::EventGenerator generator(window->GetRootWindow());
+  generator.MoveMouseTo(maximize_button->GetBoundsInScreen().CenterPoint());
+  MaximizeBubbleController* maximizer = maximize_button->maximizer();
+  ASSERT_TRUE(maximizer);
+
+  // Move the mouse cursor over the minimize button in the help bubble.
+  gfx::Point minimize_pos = maximizer->GetButtonForUnitTest(SNAP_MINIMIZE)->
+      GetBoundsInScreen().CenterPoint();
+  generator.MoveMouseTo(minimize_pos);
+
+  // Tap the snap left button in the help bubble.
+  gfx::Point snap_pos = maximizer->GetButtonForUnitTest(SNAP_LEFT)->
+      GetBoundsInScreen().CenterPoint();
+  generator.GestureTapAt(snap_pos);
+  internal::SnapSizer sizer(wm::GetWindowState(window), gfx::Point(),
+      internal::SnapSizer::LEFT_EDGE,
+      internal::SnapSizer::OTHER_INPUT);
+  EXPECT_EQ(sizer.target_bounds().ToString(), window->bounds().ToString());
+}
+
 // Test that minimizing the window per keyboard closes the maximize bubble.
 TEST_F(FrameMaximizeButtonTest, MinimizePerKeyClosesBubble) {
   aura::Window* window = widget()->GetNativeWindow();
   ash::FrameMaximizeButton* maximize_button =
       FrameMaximizeButtonTest::maximize_button();
 
   gfx::Point button_pos = maximize_button->GetBoundsInScreen().CenterPoint();
   gfx::Point off_pos(button_pos.x() + 100, button_pos.y() + 100);
 
   aura::test::EventGenerator generator(window->GetRootWindow(), off_pos);
@@ skipping 108 matching lines @@
 
   // Test that we have properly reset the state of the now inactive window.
   EXPECT_FALSE(maximize_button->maximizer());
   EXPECT_FALSE(maximize_button->phantom_window_open());
   EXPECT_TRUE(wm::GetWindowState(window)->IsNormalShowState());
   EXPECT_EQ(initial_bounds.ToString(), window->GetBoundsInScreen().ToString());
 }
 
 }  // namespace test
 }  // namespace ash