cancel overlay-scrollbar hover state when moving pointer out of window for ChromeOS

cc/input/scrollbar_animation_controller_thinning_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 "cc/input/scrollbar_animation_controller_thinning.h"
 
 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/geometry_test_utils.h"
@@ skipping 500 matching lines @@
   // stay thick and dark
   // test for 10 seconds, stay thick and dark
   for (int i = 0; i < 10; ++i) {
     time += base::TimeDelta::FromSeconds(1);
     scrollbar_controller_->Animate(time);
     EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
     EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
   }
 }
 
+// Move mouse on scrollbar and capture then move out of window. Confirm that
+// the bar stays thick and dark.
+TEST_F(ScrollbarAnimationControllerThinningTest,
+       MouseCapturedAndExitWindowFromScrollbar) {
+  base::TimeTicks time;
+  time += base::TimeDelta::FromSeconds(1);
+
+  // Move in
+  scrollbar_controller_->DidMouseMoveNear(0);
+
+  scrollbar_controller_->Animate(time);
+  time += base::TimeDelta::FromSeconds(kDuration);
+  scrollbar_controller_->Animate(time);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
+
+  // Capture
+  scrollbar_controller_->DidCaptureScrollbarBegin();
+  time += base::TimeDelta::FromSeconds(1);
+  scrollbar_controller_->Animate(time);
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
+
+  // move out of window
+  scrollbar_controller_->DidMouseMoveOffScrollbar();
+
+  // test for 10 seconds, stay thick and dark
+  for (int i = 0; i < 10; ++i) {
+    time += base::TimeDelta::FromSeconds(1);
+    scrollbar_controller_->Animate(time);
+    EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+    EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
+  }
+}
+
 }  // namespace
 }  // namespace cc