Show Overlay Scrollbar when GestureScrollUpdate

cc/input/scrollbar_animation_controller_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.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 125 matching lines @@
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   v_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
 // Check that scrollbar appears again when the layer becomes scrollable.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, AppearOnResize) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
   ExpectScrollbarsOpacity(1);
 
   // Make the Layer non-scrollable, scrollbar disappears.
   clip_layer_->SetBounds(gfx::Size(200, 200));
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   ExpectScrollbarsOpacity(0);
 
   // Make the layer scrollable, scrollbar appears again.
   clip_layer_->SetBounds(gfx::Size(100, 100));
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   ExpectScrollbarsOpacity(1);
 }
 
 // Check that scrollbar disappears when the layer becomes non-scrollable.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, HideOnResize) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
   ASSERT_TRUE(scroll_layer);
   EXPECT_EQ(gfx::Size(200, 200), scroll_layer->bounds());
 
   // 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);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(1, h_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);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(0.0f, h_scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 // Scroll content. Confirm the scrollbar appears and fades out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, BasicAppearAndFadeOut) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Scrollbar should be invisible.
   ExpectScrollbarsOpacity(0);
   EXPECT_TRUE(scrollbar_controller_->ScrollbarsHidden());
 
   // Scrollbar should appear only on scroll update.
   scrollbar_controller_->DidScrollBegin();
   ExpectScrollbarsOpacity(0);
   EXPECT_TRUE(scrollbar_controller_->ScrollbarsHidden());
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   ExpectScrollbarsOpacity(1);
   EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
 
   scrollbar_controller_->DidScrollEnd();
   ExpectScrollbarsOpacity(1);
   EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   client_.start_fade().Run();
 
   // Scrollbar should fade out over kFadeOutDuration.
   scrollbar_controller_->Animate(time);
   time += kFadeOutDuration;
   scrollbar_controller_->Animate(time);
 
   ExpectScrollbarsOpacity(0);
   EXPECT_TRUE(scrollbar_controller_->ScrollbarsHidden());
 }
 
 // Scroll content. Move the mouse near the scrollbar and confirm it becomes
 // thick. Ensure it remains visible as long as the mouse is near the scrollbar.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, MoveNearAndDontFadeOut) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 
   // Now move the mouse near the scrollbar. This should cancel the currently
   // queued fading animation and start animating thickness.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
@@ skipping 20 matching lines @@
               client_.start_fade().IsCancelled());
 }
 
 // Scroll content. Move the mouse over the scrollbar and confirm it becomes
 // thick. Ensure it remains visible as long as the mouse is over the scrollbar.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, MoveOverAndDontFadeOut) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 
   // Now move the mouse over the scrollbar. This should cancel the currently
   // queued fading animation and start animating thickness.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 0);
@@ skipping 21 matching lines @@
 }
 
 // Make sure a scrollbar captured before the thickening animation doesn't try
 // to fade out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest,
        DontFadeWhileCapturedBeforeThick) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, 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(VERTICAL, 0);
   scrollbar_controller_->DidMouseDown();
   ExpectScrollbarsOpacity(1);
   EXPECT_FLOAT_EQ(1, v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
 
   // The fade out animation should have been cleared or cancelled.
   EXPECT_TRUE(client_.start_fade().is_null() ||
               client_.start_fade().IsCancelled());
 }
 
 // Make sure a scrollbar captured then move mouse away doesn't try to fade out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest,
        DontFadeWhileCapturedThenAway) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, 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(VERTICAL, 0);
   scrollbar_controller_->DidMouseDown();
@@ skipping 15 matching lines @@
               client_.start_fade().IsCancelled());
 }
 
 // Make sure a scrollbar captured after a thickening animation doesn't try to
 // fade out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, DontFadeWhileCaptured) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 
   // Now move the mouse over the scrollbar and animate it until it's thick.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 0);
   scrollbar_controller_->Animate(time);
@@ skipping 16 matching lines @@
               client_.start_fade().IsCancelled());
 }
 
 // Make sure releasing a captured scrollbar when the mouse isn't near it, causes
 // the scrollbar to fade out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, FadeAfterReleasedFar) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 
   // Now move the mouse over the scrollbar and capture it.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 0);
   scrollbar_controller_->DidMouseDown();
@@ skipping 30 matching lines @@
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 }
 
 // Make sure releasing a captured scrollbar when the mouse is near/over it,
 // doesn't cause the scrollbar to fade out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, DontFadeAfterReleasedNear) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
 
   // Now move the mouse over the scrollbar and capture it.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 0);
   scrollbar_controller_->DidMouseDown();
@@ skipping 18 matching lines @@
 }
 
 // Make sure moving near a scrollbar while it's fading out causes it to reset
 // the opacity and thicken.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest,
        MoveNearScrollbarWhileFading) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // A fade out animation should have been enqueued. Start it.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   client_.start_fade().Run();
 
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
 
@@ skipping 19 matching lines @@
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
 // Make sure we can't capture scrollbar that's completely faded out.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, TestCantCaptureWhenFaded) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_FALSE(client_.start_fade().IsCancelled());
   client_.start_fade().Run();
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
 
   // Fade the scrollbar out completely.
@@ skipping 43 matching lines @@
   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(1, v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
 
   // Now that we've received a scroll, we should be thick without an animation.
   ExpectScrollbarsOpacity(1);
 
   // An animation for the fade should be either null or cancelled, since
   // mouse is still near the scrollbar.
   scrollbar_controller_->DidScrollEnd();
   EXPECT_TRUE(client_.start_fade().is_null() ||
               client_.start_fade().IsCancelled());
 
@@ skipping 14 matching lines @@
 
 // Tests that main thread scroll updates immediatley queue a fade out animation
 // without requiring a ScrollEnd.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest,
        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 out animation without waiting for a ScrollEnd
   // (which will never come).
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_EQ(kFadeOutDelay, client_.delay());
 
   client_.start_fade().Reset();
 
   // If we got a ScrollBegin, we shouldn't schedule the fade out animation until
   // we get a corresponding ScrollEnd.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_TRUE(client_.start_fade().is_null());
   scrollbar_controller_->DidScrollEnd();
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_EQ(kFadeOutDelay, 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(ScrollbarAnimationControllerAuraOverlayTest, ResizeFadeDuration) {
   ASSERT_TRUE(client_.delay().is_zero());
 
-  scrollbar_controller_->DidScrollUpdate(true);
+  scrollbar_controller_->DidResize();
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_EQ(kResizeFadeOutDelay, 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.
+  // gesture scroll, even if it is resizing.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(true);
+  scrollbar_controller_->DidResize();
   scrollbar_controller_->DidScrollEnd();
 
   EXPECT_FALSE(client_.start_fade().is_null());
   EXPECT_EQ(kFadeOutDelay, client_.delay());
 }
 
 // Tests that the fade effect is animated.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, FadeAnimated) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Scroll to make the scrollbars visible.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // Appearance is instant.
   ExpectScrollbarsOpacity(1);
 
   // An fade out animation should have been enqueued.
   EXPECT_EQ(kFadeOutDelay, client_.delay());
   EXPECT_FALSE(client_.start_fade().is_null());
   client_.start_fade().Run();
 
@@ skipping 11 matching lines @@
 }
 
 // Tests that the controller tells the client when the scrollbars hide/show.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, 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);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
   Mock::VerifyAndClearExpectations(&client_);
 
   scrollbar_controller_->DidScrollEnd();
 
   // Play out the fade out 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());
@@ skipping 14 matching lines @@
   EXPECT_CALL(client_, DidChangeScrollbarVisibility()).Times(1);
   time += kFadeOutDuration / 4;
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(scrollbar_controller_->ScrollbarsHidden());
   ExpectScrollbarsOpacity(0);
   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);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(scrollbar_controller_->ScrollbarsHidden());
   Mock::VerifyAndClearExpectations(&client_);
 }
 
 // Move the pointer near each scrollbar. Confirm it gets thick and narrow when
 // moved away.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, MouseNearEach) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Scroll to make the scrollbars visible.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // Near vertical scrollbar
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
@@ skipping 72 matching lines @@
   EXPECT_EQ(kFadeOutDelay, client_.delay());
 }
 
 // Move mouse near both scrollbars at the same time.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, MouseNearBoth) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Scroll to make the scrollbars visible.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // Near both Scrollbar
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
   scrollbar_controller_->DidMouseMoveNear(HORIZONTAL, 1);
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
 
   // Should animate to thickened.
   time += kThinningDuration;
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
   EXPECT_FLOAT_EQ(1, v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(1, h_scrollbar_layer_->thumb_thickness_scale_factor());
 }
 
 // Move mouse from one to the other scrollbar before animation is finished, then
 // away before animation finished.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest,
        MouseNearOtherBeforeAnimationFinished) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Scroll to make the scrollbars visible.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // Near vertical scrollbar.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
   scrollbar_controller_->Animate(time);
   ExpectScrollbarsOpacity(1);
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   v_scrollbar_layer_->thumb_thickness_scale_factor());
   EXPECT_FLOAT_EQ(kIdleThicknessScale,
                   h_scrollbar_layer_->thumb_thickness_scale_factor());
@@ skipping 45 matching lines @@
 // move.
 TEST_F(ScrollbarAnimationControllerAuraOverlayTest, MouseLeaveFadeOut) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
 
   // Move mouse near scrollbar.
   scrollbar_controller_->DidMouseMoveNear(VERTICAL, 1);
 
   // Scroll to make the scrollbars visible.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   // Should not have delay fadeout animation.
   EXPECT_TRUE(client_.start_fade().is_null() ||
               client_.start_fade().IsCancelled());
 
   // Mouse leave.
   scrollbar_controller_->DidMouseLeave();
 
   // An fade out animation should have been enqueued.
@@ skipping 118 matching lines @@
  protected:
   ScrollbarOrientation orientation() const override { return VERTICAL; }
 };
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, DelayAnimationOnResize) {
   scrollbar_layer_->layer_tree_impl()
       ->property_trees()
       ->effect_tree.OnOpacityAnimated(0.0f,
                                       scrollbar_layer_->effect_tree_index(),
                                       scrollbar_layer_->layer_tree_impl());
+  // We should use the gesture delay rather than the resize delay if we're in a
+  // gesture scroll, even if it is resizing.
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(true);
+  scrollbar_controller_->DidResize();
   scrollbar_controller_->DidScrollEnd();
   // Normal Animation delay of 2 seconds.
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
   EXPECT_EQ(delay_, base::TimeDelta::FromSeconds(2));
 
   scrollbar_layer_->layer_tree_impl()
       ->property_trees()
       ->effect_tree.OnOpacityAnimated(0.0f,
                                       scrollbar_layer_->effect_tree_index(),
                                       scrollbar_layer_->layer_tree_impl());
-  scrollbar_controller_->DidScrollUpdate(true);
+  scrollbar_controller_->DidResize();
   // Delay animation on resize to 5 seconds.
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
   EXPECT_EQ(delay_, base::TimeDelta::FromSeconds(5));
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, HiddenInBegin) {
   scrollbar_layer_->layer_tree_impl()
       ->property_trees()
       ->effect_tree.OnOpacityAnimated(0.0f,
                                       scrollbar_layer_->effect_tree_index(),
@@ skipping 30 matching lines @@
   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);
+  scrollbar_controller_->WillUpdateScroll();
   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);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(VerticalScrollbarAnimationControllerAndroidTest, 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(VERTICAL, scrollbar_layer_->orientation());
 
   // Shrink along X axis, vertical scrollbar should remain invisible.
   clip_layer_->SetBounds(gfx::Size(100, 200));
   EXPECT_EQ(gfx::Size(100, 200), clip_layer_->bounds());
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 
   // Shrink along Y axis and expand along X, vertical scrollbar should appear.
   clip_layer_->SetBounds(gfx::Size(200, 100));
   EXPECT_EQ(gfx::Size(200, 100), clip_layer_->bounds());
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, HideOnUserNonScrollableHorz) {
   EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
 
   LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
   ASSERT_TRUE(scroll_layer);
   scroll_layer->set_user_scrollable_horizontal(false);
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, ShowOnUserNonScrollableVert) {
   EXPECT_EQ(HORIZONTAL, scrollbar_layer_->orientation());
 
   LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
   ASSERT_TRUE(scroll_layer);
   scroll_layer->set_user_scrollable_vertical(false);
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(VerticalScrollbarAnimationControllerAndroidTest,
        HideOnUserNonScrollableVert) {
   EXPECT_EQ(VERTICAL, scrollbar_layer_->orientation());
 
   LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
   ASSERT_TRUE(scroll_layer);
   scroll_layer->set_user_scrollable_vertical(false);
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(VerticalScrollbarAnimationControllerAndroidTest,
        ShowOnUserNonScrollableHorz) {
   EXPECT_EQ(VERTICAL, scrollbar_layer_->orientation());
 
   LayerImpl* scroll_layer = host_impl_.active_tree()->LayerById(1);
   ASSERT_TRUE(scroll_layer);
   scroll_layer->set_user_scrollable_horizontal(false);
 
   scrollbar_controller_->DidScrollBegin();
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollEnd();
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, AwakenByScrollingGesture) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->DidScrollBegin();
   EXPECT_FALSE(did_request_animate_);
 
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   EXPECT_TRUE(start_fade_.Equals(base::Closure()));
 
   time += base::TimeDelta::FromSeconds(100);
 
   scrollbar_controller_->Animate(time);
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
@@ skipping 17 matching lines @@
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
 
   scrollbar_controller_->DidScrollBegin();
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   scrollbar_controller_->DidScrollEnd();
 
   start_fade_.Run();
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
 
   time += base::TimeDelta::FromSeconds(2);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
@@ skipping 13 matching lines @@
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, AwakenByProgrammaticScroll) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(did_request_animate_);
 
   start_fade_.Run();
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(2.0f / 3.0f, scrollbar_layer_->Opacity());
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(did_request_animate_);
 
   start_fade_.Run();
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   time += base::TimeDelta::FromSeconds(2);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(2.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   start_fade_.Run();
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(2.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest,
        AnimationPreservedByNonScrollingGesture) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   start_fade_.Run();
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
@@ skipping 18 matching lines @@
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest,
        AnimationOverriddenByScrollingGesture) {
   base::TimeTicks time;
   time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(did_request_animate_);
   start_fade_.Run();
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(2.0f / 3.0f, scrollbar_layer_->Opacity());
 
   scrollbar_controller_->DidScrollBegin();
   EXPECT_FLOAT_EQ(2.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->Animate(time);
   EXPECT_TRUE(did_request_animate_);
   did_request_animate_ = false;
   EXPECT_FLOAT_EQ(1.0f / 3.0f, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
-  scrollbar_controller_->DidScrollUpdate(false);
+  scrollbar_controller_->WillUpdateScroll();
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(1, scrollbar_layer_->Opacity());
 
   time += base::TimeDelta::FromSeconds(1);
   scrollbar_controller_->DidScrollEnd();
   EXPECT_FALSE(did_request_animate_);
   EXPECT_FLOAT_EQ(1, scrollbar_layer_->Opacity());
 }
 
 }  // namespace
 }  // namespace cc