Prevent overlay scrollbars expand or hover together

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"
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::AtLeast;
 using testing::Mock;
 using testing::NiceMock;
 using testing::_;
 
 namespace cc {
 namespace {
 
 // These constants are hard-coded and should match the values in
 // scrollbar_animation_controller_thinning.cc.
 const float kIdleThicknessScale = 0.4f;
-const float kDefaultMouseMoveDistanceToTriggerAnimation = 25.f;
 
 class MockScrollbarAnimationControllerClient
     : public ScrollbarAnimationControllerClient {
  public:
   explicit MockScrollbarAnimationControllerClient(LayerTreeHostImpl* host_impl)
       : host_impl_(host_impl) {}
   virtual ~MockScrollbarAnimationControllerClient() {}
 
-  void PostDelayedScrollbarAnimationTask(const base::Closure& start_fade,
-                                         base::TimeDelta delay) override {
-    start_fade_ = start_fade;
-    delay_ = delay;
-  }
+  void PostDelayedScrollbarAnimationTask(const base::Closure&,
+                                         base::TimeDelta) override {}
   void SetNeedsRedrawForScrollbarAnimation() override {}
   void SetNeedsAnimateForScrollbarAnimation() override {}
   ScrollbarSet ScrollbarsFor(int scroll_layer_id) const override {
     return host_impl_->ScrollbarsFor(scroll_layer_id);
   }
   MOCK_METHOD0(DidChangeScrollbarVisibility, void());
 
-  base::Closure& start_fade() { return start_fade_; }
-  base::TimeDelta& delay() { return delay_; }
-
  private:
-  base::Closure start_fade_;
-  base::TimeDelta delay_;
   LayerTreeHostImpl* host_impl_;
 };
 
 class ScrollbarAnimationControllerThinningTest : public testing::Test {
  public:
   ScrollbarAnimationControllerThinningTest()
       : host_impl_(&task_runner_provider_, &task_graph_runner_),
         client_(&host_impl_) {}
 
  protected:
   const base::TimeDelta kDelayBeforeStarting = base::TimeDelta::FromSeconds(2);
   const base::TimeDelta kResizeDelayBeforeStarting =
       base::TimeDelta::FromSeconds(5);
   const base::TimeDelta kFadeDuration = base::TimeDelta::FromSeconds(3);
   const base::TimeDelta kThinningDuration = base::TimeDelta::FromSeconds(2);
 
   void SetUp() override {
     std::unique_ptr<LayerImpl> scroll_layer =
         LayerImpl::Create(host_impl_.active_tree(), 1);
     std::unique_ptr<LayerImpl> clip =
-        LayerImpl::Create(host_impl_.active_tree(), 3);
+        LayerImpl::Create(host_impl_.active_tree(), 2);
     clip_layer_ = clip.get();
     scroll_layer->SetScrollClipLayer(clip_layer_->id());
     LayerImpl* scroll_layer_ptr = scroll_layer.get();
 
-    const int kId = 2;
     const int kThumbThickness = 10;
     const int kTrackStart = 0;
     const bool kIsLeftSideVerticalScrollbar = false;
     const bool kIsOverlayScrollbar = true;
 
-    std::unique_ptr<SolidColorScrollbarLayerImpl> scrollbar =
+    std::unique_ptr<SolidColorScrollbarLayerImpl> h_scrollbar =
         SolidColorScrollbarLayerImpl::Create(
-            host_impl_.active_tree(), kId, HORIZONTAL, kThumbThickness,
+            host_impl_.active_tree(), 3, HORIZONTAL, kThumbThickness,
             kTrackStart, kIsLeftSideVerticalScrollbar, kIsOverlayScrollbar);
-    scrollbar_layer_ = scrollbar.get();
+    std::unique_ptr<SolidColorScrollbarLayerImpl> v_scrollbar =
+        SolidColorScrollbarLayerImpl::Create(
+            host_impl_.active_tree(), 4, VERTICAL, kThumbThickness, kTrackStart,
+            kIsLeftSideVerticalScrollbar, kIsOverlayScrollbar);
+    v_scrollbar_layer_ = v_scrollbar.get();
+    h_scrollbar_layer_ = h_scrollbar.get();
 
-    scroll_layer->test_properties()->AddChild(std::move(scrollbar));
+    scroll_layer->test_properties()->AddChild(std::move(v_scrollbar));
+    scroll_layer->test_properties()->AddChild(std::move(h_scrollbar));
     clip_layer_->test_properties()->AddChild(std::move(scroll_layer));
     host_impl_.active_tree()->SetRootLayerForTesting(std::move(clip));
 
-    scrollbar_layer_->SetScrollLayerId(scroll_layer_ptr->id());
-    scrollbar_layer_->test_properties()->opacity_can_animate = true;
+    v_scrollbar_layer_->SetScrollLayerId(scroll_layer_ptr->id());
+    h_scrollbar_layer_->SetScrollLayerId(scroll_layer_ptr->id());
+    v_scrollbar_layer_->test_properties()->opacity_can_animate = true;
+    h_scrollbar_layer_->test_properties()->opacity_can_animate = true;
     clip_layer_->SetBounds(gfx::Size(100, 100));
     scroll_layer_ptr->SetBounds(gfx::Size(200, 200));
     host_impl_.active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
     scrollbar_controller_ = ScrollbarAnimationControllerThinning::Create(
         scroll_layer_ptr->id(), &client_, kDelayBeforeStarting,
         kResizeDelayBeforeStarting, kFadeDuration, kThinningDuration);
   }
 
   FakeImplTaskRunnerProvider task_runner_provider_;
   TestTaskGraphRunner task_graph_runner_;
   FakeLayerTreeHostImpl host_impl_;
   std::unique_ptr<ScrollbarAnimationControllerThinning> scrollbar_controller_;
   LayerImpl* clip_layer_;
-  SolidColorScrollbarLayerImpl* scrollbar_layer_;
+  SolidColorScrollbarLayerImpl* v_scrollbar_layer_;
+  SolidColorScrollbarLayerImpl* h_scrollbar_layer_;
   NiceMock<MockScrollbarAnimationControllerClient> client_;
 };
 

[bokan, 2016/12/08 19:34:07]

Some more cases I'd like to see:

-Move mouse near both scrollbars at the same time.
-Move mouse from one to the other scrollbar before animation is finished.
-Move mouse from one to the other as above and then back.

Basically, the tests here should make sure the coordination between the two
isn't getting confused.

-// Check initialization of scrollbar. Should start off invisible and thin.
+// Check initialization of scrollbars. Should start off invisible and thin.
 TEST_F(ScrollbarAnimationControllerThinningTest, Idle) {
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(0.4f, scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(0.0f, v_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  v_scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(0.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  h_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
-// Check that scrollbar appears again when the layer becomes scrollable.
-TEST_F(ScrollbarAnimationControllerThinningTest, AppearOnResize) {
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // Make the Layer non-scrollable, scrollbar disappears.
-  clip_layer_->SetBounds(gfx::Size(200, 200));
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-
-  // Make the layer scrollable, scrollbar appears again.
-  clip_layer_->SetBounds(gfx::Size(100, 100));
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-}
-
-// Check that scrollbar disappears when the layer becomes non-scrollable.
-TEST_F(ScrollbarAnimationControllerThinningTest, HideOnResize) {
-  LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
-  ASSERT_TRUE(scroll_layer);
-  EXPECT_EQ(gfx::Size(200, 200), scroll_layer->bounds());
-
-  EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
-
-  // Shrink along X axis, horizontal scrollbar should appear.
-  clip_layer_->SetBounds(gfx::Size(100, 200));
-  EXPECT_EQ(gfx::Size(100, 200), clip_layer_->bounds());
-
-  scrollbar_controller_->DidScrollBegin();
-
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  scrollbar_controller_->DidScrollEnd();
-
-  // Shrink along Y axis and expand along X, horizontal scrollbar
-  // should disappear.
-  clip_layer_->SetBounds(gfx::Size(200, 100));
-  EXPECT_EQ(gfx::Size(200, 100), clip_layer_->bounds());
-
-  scrollbar_controller_->DidScrollBegin();
-
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-
-  scrollbar_controller_->DidScrollEnd();
-}
-
-// Scroll content. Confirm the scrollbar appears and fades out.
-TEST_F(ScrollbarAnimationControllerThinningTest, BasicAppearAndFadeOut) {
+// Scroll content. Move the mouse near the scrollbar and confirm it becomes

[bokan, 2016/12/08 19:34:07]

"mouse near the" -> "mouse near each"

+// thick.
+TEST_F(ScrollbarAnimationControllerThinningTest, MoveNear) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
-  // Scrollbar should be invisible by default.
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-
-  // Scrollbar should appear only on scroll update.
-  scrollbar_controller_->DidScrollBegin();
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  scrollbar_controller_->DidScrollEnd();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-
-  // Scrollbar should fade out over kFadeDuration.
-  scrollbar_controller_->Animate(time);
-  time += kFadeDuration;
-  scrollbar_controller_->Animate(time);
-
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-}
-
-// Scroll content. Move the mouse near the scrollbar and confirm it becomes
-// thick. Ensure it fades out after that.
-TEST_F(ScrollbarAnimationControllerThinningTest, MoveNearAndFadeOut) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
   scrollbar_controller_->DidScrollBegin();
   scrollbar_controller_->DidScrollUpdate(false);
   scrollbar_controller_->DidScrollEnd();
 
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
 
-  // Now move the mouse near the scrollbar. This should cancel the currently
-  // queued fading animation and start animating thickness.
-  scrollbar_controller_->DidMouseMoveNear(1);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+  // Now move the mouse near the v scrollbar. This should start animating

[bokan, 2016/12/08 19:34:07]

Nit: v -> vertical

+  // thickness.
+  scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-  EXPECT_TRUE(client_.start_fade().IsCancelled());
+                  v_scrollbar_layer_->thumb_thickness_scale_factor());
 
   // Scrollbar should become thick.
   scrollbar_controller_->Animate(time);
   time += kThinningDuration;
   scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->thumb_thickness_scale_factor());
 
-  // Once the thickening animation is complete, it should enqueue the delayed
-  // fade animation.
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_FALSE(client_.start_fade().IsCancelled());
+  // move the mouse near the h scrollbar. This should start animating thickness.
+  scrollbar_controller_->DidMouseMoveNear(HORIZONTAL, 1);
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  h_scrollbar_layer_->thumb_thickness_scale_factor());
+
+  // Scrollbar should become thick.
+  scrollbar_controller_->Animate(time);
+  time += kThinningDuration;
+  scrollbar_controller_->Animate(time);
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
 // Scroll content. Move the mouse over the scrollbar and confirm it becomes
-// thick. Ensure it fades out after that.
-TEST_F(ScrollbarAnimationControllerThinningTest, MoveOverAndFadeOut) {
+// thick.
+TEST_F(ScrollbarAnimationControllerThinningTest, MoveOver) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
   scrollbar_controller_->DidScrollUpdate(false);
   scrollbar_controller_->DidScrollEnd();
 
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-
-  // Now move the mouse over the scrollbar. This should cancel the currently
-  // queued fading animation and start animating thickness.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+  // Now move the mouse over the v scrollbar.
+  scrollbar_controller_->DidMouseMoveNear(VERTICAL, 0);
+  scrollbar_controller_->DidMouseMoveNear(HORIZONTAL, 100);
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-  EXPECT_TRUE(client_.start_fade().IsCancelled());
+                  v_scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  h_scrollbar_layer_->thumb_thickness_scale_factor());
 
   // Scrollbar should become thick.
   scrollbar_controller_->Animate(time);
   time += kThinningDuration;
   scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  h_scrollbar_layer_->thumb_thickness_scale_factor());
 
-  // Once the thickening animation is complete, it should enqueue the delayed
-  // fade animation.
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_FALSE(client_.start_fade().IsCancelled());
-}
+  // Now move the mouse over the h scrollbar.
+  scrollbar_controller_->DidMouseMoveNear(VERTICAL, 100);
+  scrollbar_controller_->DidMouseMoveNear(HORIZONTAL, 0);
 
-// Make sure a scrollbar captured before the thickening animation doesn't try
-// to fade out.
-TEST_F(ScrollbarAnimationControllerThinningTest,
-       DontFadeWhileCapturedBeforeThick) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(kIdleThicknessScale,
+                  h_scrollbar_layer_->thumb_thickness_scale_factor());
 
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-
-  // Now move the mouse over the scrollbar and capture it. It should become
-  // thick without need for an animation.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->DidMouseDown();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // The fade animation should have been cancelled.
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_TRUE(client_.start_fade().IsCancelled());
-}
-
-// Make sure a scrollbar captured after a thickening animation doesn't try to
-// fade out.
-TEST_F(ScrollbarAnimationControllerThinningTest, DontFadeWhileCaptured) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-
-  // Now move the mouse over the scrollbar and animate it until it's thick.
-  scrollbar_controller_->DidMouseMoveNear(0);
+  // Scrollbar should become thick.
   scrollbar_controller_->Animate(time);
   time += kThinningDuration;
   scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Since the scrollbar became thick, it should have queued up a fade.
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_FALSE(client_.start_fade().IsCancelled());
-
-  // Make sure capturing the scrollbar stops the fade.
-  scrollbar_controller_->DidMouseDown();
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_TRUE(client_.start_fade().IsCancelled());
-}
-
-// Make sure releasing a captured scrollbar causes it to fade out.
-TEST_F(ScrollbarAnimationControllerThinningTest, FadeAfterReleased) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-
-  // Now move the mouse over the scrollbar and capture it.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->DidMouseDown();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Since the scrollbar became thick, it should have queued up a fade.
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_TRUE(client_.start_fade().IsCancelled());
-
-  scrollbar_controller_->DidMouseUp();
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_FALSE(client_.start_fade().IsCancelled());
-}
-
-// Make sure moving near a scrollbar while it's fading out causes it to reset
-// the opacity and thicken.
-TEST_F(ScrollbarAnimationControllerThinningTest, MoveNearScrollbarWhileFading) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // An animation should have been enqueued. Start it.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // Proceed half way through the fade out animation.
-  time += kFadeDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.5f, scrollbar_layer_->Opacity());
-
-  // Now move the mouse near the scrollbar. It should reset opacity to 1
-  // instantly and start animating to thick.
-  scrollbar_controller_->DidMouseMoveNear(1);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, v_scrollbar_layer_->Opacity());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Make sure capturing a scrollbar while it's fading out causes it to reset the
-// opacity and thicken instantly.
-TEST_F(ScrollbarAnimationControllerThinningTest, CaptureScrollbarWhileFading) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // Move mouse over the scrollbar.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // A fade animation should have been enqueued. Start it.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // Proceed half way through the fade out animation.
-  time += kFadeDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.5f, scrollbar_layer_->Opacity());
-
-  // Now capture the scrollbar. It should reset opacity to 1 instantly.
-  scrollbar_controller_->DidMouseDown();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Make sure we can't capture scrollbar that's completely faded out
-TEST_F(ScrollbarAnimationControllerThinningTest, TestCantCaptureWhenFaded) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // Move mouse over the scrollbar.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // A fade animation should have been enqueued. Start it.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // Fade the scrollbar out completely.
-  time += kFadeDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  client_.start_fade().Reset();
-
-  // Now try to capture the scrollbar. It shouldn't do anything since it's
-  // completely faded out.
-  scrollbar_controller_->DidMouseDown();
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-  EXPECT_TRUE(client_.start_fade().is_null());
-
-  // Similarly, releasing the scrollbar should have no effect.
-  scrollbar_controller_->DidMouseUp();
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-  EXPECT_TRUE(client_.start_fade().is_null());
-}
-
-// Initiate a scroll when the pointer is already near the scrollbar. It should
-// appear thick and remain thick.
-TEST_F(ScrollbarAnimationControllerThinningTest, ScrollWithMouseNear) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidMouseMoveNear(1);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-
-  // Since the scrollbar isn't visible yet (because we haven't scrolled), we
-  // shouldn't have applied the thickening.
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-
-  // Now that we've received a scroll, we should be thick without an animation.
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // An animation for the fade should have been enqueued.
-  scrollbar_controller_->DidScrollEnd();
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-
-  client_.start_fade().Run();
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Scrollbar should still be thick, even though the scrollbar fades out.
-  time += kFadeDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Move the pointer near the scrollbar. Confirm it gets thick and narrow when
-// moved away.
-TEST_F(ScrollbarAnimationControllerThinningTest, MouseNear) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  scrollbar_controller_->DidMouseMoveNear(1);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Should animate to thickened.
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Subsequent moves within the nearness threshold should not change anything.
-  scrollbar_controller_->DidMouseMoveNear(2);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Now move away from bar.
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Move the pointer over the scrollbar. Make sure it gets thick that it gets
-// thin when moved away.
-TEST_F(ScrollbarAnimationControllerThinningTest, MouseOver) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Should animate to thickened.
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Subsequent moves should not change anything.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Moving off the scrollbar but still withing the "near" threshold should do
-  // nothing.
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation - 1.f);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Now move away from bar.
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// First move the pointer over the scrollbar off of it. Make sure the thinning
-// animation kicked off in DidMouseMoveOffScrollbar gets overridden by the
-// thickening animation in the DidMouseMoveNear call.
-TEST_F(ScrollbarAnimationControllerThinningTest,
-       MouseNearThenAwayWhileAnimating) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Should animate to thickened.
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // This is tricky. The DidMouseLeave() is sent before the
-  // subsequent DidMouseMoveNear(), if the mouse moves in that direction.
-  // This results in the thumb thinning. We want to make sure that when the
-  // thumb starts expanding it doesn't first narrow to the idle thinness.
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidMouseLeave();
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Let the animation run half of the way through the thinning animation.
-  time += kThinningDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f - (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Now we get a notification for the mouse moving over the scroller. The
-  // animation is reset to the thickening direction but we won't start
-  // thickening until the new animation catches up to the current thickness.
-  scrollbar_controller_->DidMouseMoveNear(1);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f - (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Until we reach the half way point, the animation will have no effect.
-  time += kThinningDuration / 4;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f - (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  time += kThinningDuration / 4;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f - (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // We're now at three quarters of the way through so it should now started
-  // thickening again.
-  time += kThinningDuration / 4;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(kIdleThicknessScale + 3 * (1.0f - kIdleThicknessScale) / 4.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // And all the way to the end.
-  time += kThinningDuration / 4;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// First move the pointer on the scrollbar, then press it, then away.
-// Confirm that the bar gets thick. Then mouse up. Confirm that
-// the bar gets thin.
-TEST_F(ScrollbarAnimationControllerThinningTest,
-       MouseCaptureAndReleaseOutOfBar) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Move over the scrollbar.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += kFadeDuration;
-  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_->DidMouseDown();
-  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());
-
-  // Should stay thick for a while.
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-
-  // Move outside the "near" threshold. Because the scrollbar is captured it
-  // should remain thick.
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Release.
-  scrollbar_controller_->DidMouseUp();
-
-  // Should become thin.
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// First move the pointer on the scrollbar, then press it, then away.  Confirm
-// that the bar gets thick. Then move point on the scrollbar and mouse up.
-// Confirm that the bar stays thick.
-TEST_F(ScrollbarAnimationControllerThinningTest, MouseCaptureAndReleaseOnBar) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Move over scrollbar.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Capture. Nothing should change.
-  scrollbar_controller_->DidMouseDown();
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Move away from scrollbar. Nothing should change.
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation);
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Move over scrollbar and release. Since we're near the scrollbar, it should
-  // remain thick.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->DidMouseUp();
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->Animate(time);
-  time += base::TimeDelta::FromSeconds(10);
-  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.
-TEST_F(ScrollbarAnimationControllerThinningTest,
-       MouseCapturedAndExitWindowFromScrollbar) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Move mouse over scrollbar.
-  scrollbar_controller_->DidMouseMoveNear(0);
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  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_->DidMouseDown();
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Move out of window. Since the scrollbar is capture, it shouldn't change in
-  // any way.
-  scrollbar_controller_->DidMouseLeave();
-  scrollbar_controller_->Animate(time);
-  time += kThinningDuration;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Tests that the thickening/thinning effects are animated.
-TEST_F(ScrollbarAnimationControllerThinningTest, ThicknessAnimated) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Move mouse near scrollbar. Test that at half the duration time, the
-  // thickness is half way through its animation.
-  scrollbar_controller_->DidMouseMoveNear(1);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  time += kThinningDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(kIdleThicknessScale + (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  time += kThinningDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  // Move mouse away from scrollbar. Same check.
-  time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidMouseMoveNear(
-      kDefaultMouseMoveDistanceToTriggerAnimation);
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->thumb_thickness_scale_factor());
-
-  time += kThinningDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f - (1.0f - kIdleThicknessScale) / 2.0f,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-
-  time += kThinningDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(kIdleThicknessScale,
-                  scrollbar_layer_->thumb_thickness_scale_factor());
-}
-
-// Tests that main thread scroll updates immediatley queue a fade animation
-// without requiring a ScrollEnd.
-TEST_F(ScrollbarAnimationControllerThinningTest, MainThreadScrollQueuesFade) {
-  ASSERT_TRUE(client_.start_fade().is_null());
-
-  // A ScrollUpdate without a ScrollBegin indicates a main thread scroll update
-  // so we should schedule a fade animation without waiting for a ScrollEnd
-  // (which will never come).
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-
-  client_.start_fade().Reset();
-
-  // If we got a ScrollBegin, we shouldn't schedule the fade animation until we
-  // get a corresponding ScrollEnd.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_TRUE(client_.start_fade().is_null());
-  scrollbar_controller_->DidScrollEnd();
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-}
-
-// Make sure that if the scroll update is as a result of a resize, we use the
-// resize delay time instead of the default one.
-TEST_F(ScrollbarAnimationControllerThinningTest, ResizeFadeDuration) {
-  ASSERT_TRUE(client_.delay().is_zero());
-
-  scrollbar_controller_->DidScrollUpdate(true);
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_EQ(kResizeDelayBeforeStarting, client_.delay());
-
-  client_.delay() = base::TimeDelta();
-
-  // We should use the gesture delay rather than the resize delay if we're in a
-  // gesture scroll, even if the resize param is set.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(true);
-  scrollbar_controller_->DidScrollEnd();
-
-  EXPECT_FALSE(client_.start_fade().is_null());
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-}
-
-// Tests that the fade effect is animated.
-TEST_F(ScrollbarAnimationControllerThinningTest, FadeAnimated) {
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  scrollbar_controller_->DidScrollEnd();
-
-  // Appearance is instant.
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  // An animation should have been enqueued.
-  EXPECT_EQ(kDelayBeforeStarting, client_.delay());
-  EXPECT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  // Test that at half the fade duration time, the opacity is at half.
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
-
-  time += kFadeDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.5f, scrollbar_layer_->Opacity());
-
-  time += kFadeDuration / 2;
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-}
-
-// Tests that the controller tells the client when the scrollbars hide/show.
-TEST_F(ScrollbarAnimationControllerThinningTest, NotifyChangedVisibility) {
-  base::TimeTicks time;
-  time += base::TimeDelta::FromSeconds(1);
-
-  EXPECT_CALL(client_, DidChangeScrollbarVisibility()).Times(1);
-  // Scroll to make the scrollbars visible.
-  scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
-  Mock::VerifyAndClearExpectations(&client_);
-
-  scrollbar_controller_->DidScrollEnd();
-
-  // Play out the fade animation. We shouldn't notify that the scrollbars are
-  // hidden until the animation is completly over. We can (but don't have to)
-  // notify during the animation that the scrollbars are still visible.
-  EXPECT_CALL(client_, DidChangeScrollbarVisibility()).Times(0);
-  ASSERT_FALSE(client_.start_fade().is_null());
-  client_.start_fade().Run();
-  scrollbar_controller_->Animate(time);
-  time += kFadeDuration / 4;
-  EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
-  scrollbar_controller_->Animate(time);
-  time += kFadeDuration / 4;
-  EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
-  scrollbar_controller_->Animate(time);
-  time += kFadeDuration / 4;
-  EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
-  scrollbar_controller_->Animate(time);
-  EXPECT_FLOAT_EQ(0.25f, scrollbar_layer_->Opacity());
-  Mock::VerifyAndClearExpectations(&client_);
-
-  EXPECT_CALL(client_, DidChangeScrollbarVisibility()).Times(1);
-  time += kFadeDuration / 4;
-  scrollbar_controller_->Animate(time);
-  EXPECT_TRUE(scrollbar_controller_->ScrollbarsHidden());
-  EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
-  Mock::VerifyAndClearExpectations(&client_);
-
-  // Calling DidScrollUpdate without a begin (i.e. update from commit) should
-  // also notify.
-  EXPECT_CALL(client_, DidChangeScrollbarVisibility()).Times(1);
-  scrollbar_controller_->DidScrollUpdate(false);
-  EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
-  Mock::VerifyAndClearExpectations(&client_);
+                  v_scrollbar_layer_->thumb_thickness_scale_factor());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->Opacity());
+  EXPECT_FLOAT_EQ(1.0f, h_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
 }  // namespace
 }  // namespace cc