Normalize top controls offset to (0, 1), Chromium-side.

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 2443 matching lines @@
     viewport_size_ = gfx::Size(clip_size_.width(),
                                clip_size_.height() + top_controls_height_);
   }
 
   bool CreateHostImpl(const LayerTreeSettings& settings,
                       scoped_ptr<OutputSurface> output_surface) override {
     bool init =
         LayerTreeHostImplTest::CreateHostImpl(settings, output_surface.Pass());
     if (init && settings.calculate_top_controls_position) {
       host_impl_->active_tree()->set_top_controls_height(top_controls_height_);
-      host_impl_->active_tree()->set_top_controls_delta(top_controls_height_);
-      host_impl_->top_controls_manager()->SetTopControlsHeight(
-          top_controls_height_);
-      host_impl_->DidChangeTopControlsPosition();
+      host_impl_->active_tree()->SetCurrentTopControlsShownRatio(1.f);
     }
     return init;
   }
 
   void SetupTopControlsAndScrollLayer() {
     scoped_ptr<LayerImpl> root =
         LayerImpl::Create(host_impl_->active_tree(), 1);
     scoped_ptr<LayerImpl> root_clip =
         LayerImpl::Create(host_impl_->active_tree(), 2);
     root_clip->SetBounds(clip_size_);
@@ skipping 13 matching lines @@
         Layer::INVALID_ID, page_scale_layer_id, inner_viewport_scroll_layer_id,
         Layer::INVALID_ID);
     // Set a viewport size that is large enough to contain both the top controls
     // and some content.
     host_impl_->SetViewportSize(viewport_size_);
     host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
 
     host_impl_->DidChangeTopControlsPosition();
 
     host_impl_->CreatePendingTree();
+    host_impl_->sync_tree()->set_top_controls_height(top_controls_height_);
     root =
         LayerImpl::Create(host_impl_->sync_tree(), 1);
     root_clip =
         LayerImpl::Create(host_impl_->sync_tree(), 2);
     root_clip->SetBounds(clip_size_);
     root->SetScrollClipLayer(root_clip->id());
     root->SetBounds(layer_size_);
     root->SetContentBounds(layer_size_);
     root->SetPosition(gfx::PointF());
     root->SetDrawsContent(false);
@@ skipping 11 matching lines @@
     host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
     host_impl_->DidChangeTopControlsPosition();
   }
 
   void SetupTopControlsAndScrollLayerWithVirtualViewport(
       const gfx::Size& inner_viewport_size,
       const gfx::Size& outer_viewport_size,
       const gfx::Size& scroll_layer_size) {
     CreateHostImpl(settings_, CreateOutputSurface());
     host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
+    host_impl_->sync_tree()->set_top_controls_height(top_controls_height_);
     host_impl_->DidChangeTopControlsPosition();
 
     scoped_ptr<LayerImpl> root =
         LayerImpl::Create(host_impl_->active_tree(), 1);
     scoped_ptr<LayerImpl> root_clip =
         LayerImpl::Create(host_impl_->active_tree(), 2);
     scoped_ptr<LayerImpl> page_scale =
         LayerImpl::Create(host_impl_->active_tree(), 3);
 
     scoped_ptr<LayerImpl> outer_scroll =
@@ skipping 58 matching lines @@
   // (3) matches the movement of the top controls.
   gfx::Vector2dF top_controls_scroll_delta(0.f, 5.25f);
   host_impl_->top_controls_manager()->ScrollBegin();
   host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
   host_impl_->top_controls_manager()->ScrollEnd();
 
   LayerImpl* inner_viewport_scroll_layer =
       host_impl_->active_tree()->InnerViewportScrollLayer();
   DCHECK(inner_viewport_scroll_layer);
   host_impl_->ScrollEnd();
-  EXPECT_EQ(top_controls_scroll_delta,
-            inner_viewport_scroll_layer->FixedContainerSizeDelta());
+  EXPECT_FLOAT_EQ(top_controls_scroll_delta.y(),
+                  inner_viewport_scroll_layer->FixedContainerSizeDelta().y());
 }
 
 // In this test, the outer viewport is initially unscrollable. We test that a
 // scroll initiated on the inner viewport, causing the top controls to show and
 // thus making the outer viewport scrollable, still scrolls the outer viewport.
 TEST_F(LayerTreeHostImplTopControlsTest,
     TopControlsOuterViewportBecomesScrollable) {
   SetupTopControlsAndScrollLayerWithVirtualViewport(
       gfx::Size(10, 50), gfx::Size(10, 50), gfx::Size(10, 100));
   DrawFrame();
@@ skipping 10 matching lines @@
   // Need SetDrawsContent so ScrollBegin's hit test finds an actual layer.
   outer_scroll->SetDrawsContent(true);
   host_impl_->active_tree()->PushPageScaleFromMainThread(2.f, 1.f, 2.f);
 
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, 50.f));
 
   // The entire scroll delta should have been used to hide the top controls.
   // The viewport layers should be resized back to their full sizes.
-  EXPECT_EQ(0.f,
-      host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(0.f, host_impl_->active_tree()->CurrentTopControlsShownRatio());
   EXPECT_EQ(0.f, inner_scroll->CurrentScrollOffset().y());
   EXPECT_EQ(100.f, inner_container->BoundsForScrolling().height());
   EXPECT_EQ(100.f, outer_container->BoundsForScrolling().height());
 
   // The inner viewport should be scrollable by 50px * page_scale.
   host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, 100.f));
   EXPECT_EQ(50.f, inner_scroll->CurrentScrollOffset().y());
   EXPECT_EQ(0.f, outer_scroll->CurrentScrollOffset().y());
   EXPECT_EQ(gfx::ScrollOffset(), outer_scroll->MaxScrollOffset());
 
   host_impl_->ScrollEnd();
 
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), inner_scroll);
 
   host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -50.f));
 
   // The entire scroll delta should have been used to show the top controls.
   // The outer viewport should be resized to accomodate and scrolled to the
   // bottom of the document to keep the viewport in place.
-  EXPECT_EQ(50.f,
-      host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(1.f, host_impl_->active_tree()->CurrentTopControlsShownRatio());
   EXPECT_EQ(50.f, outer_container->BoundsForScrolling().height());
   EXPECT_EQ(50.f, inner_container->BoundsForScrolling().height());
   EXPECT_EQ(25.f, outer_scroll->CurrentScrollOffset().y());
   EXPECT_EQ(25.f, inner_scroll->CurrentScrollOffset().y());
 
   // Now when we continue scrolling, make sure the outer viewport gets scrolled
   // since it wasn't scrollable when the scroll began.
   host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -20.f));
   EXPECT_EQ(15.f, outer_scroll->CurrentScrollOffset().y());
   EXPECT_EQ(25.f, inner_scroll->CurrentScrollOffset().y());
@@ skipping 25 matching lines @@
   host_impl_->active_tree()->PushPageScaleFromMainThread(page_scale, 1.f, 2.f);
 
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
 
   // Scroll down, the top controls hiding should expand the viewport size so
   // the delta should be equal to the scroll distance.
   gfx::Vector2dF top_controls_scroll_delta(0.f, 20.f);
   host_impl_->top_controls_manager()->ScrollBegin();
   host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
-  EXPECT_EQ(top_controls_height_ - top_controls_scroll_delta.y(),
-            host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(top_controls_height_ - top_controls_scroll_delta.y(),
+                  host_impl_->top_controls_manager()->ContentTopOffset());
   EXPECT_VECTOR_EQ(top_controls_scroll_delta,
                    outer_viewport_scroll_layer->FixedContainerSizeDelta());
   host_impl_->ScrollEnd();
 
   // Scroll past the maximum extent. The delta shouldn't be greater than the
   // top controls height.
   host_impl_->top_controls_manager()->ScrollBegin();
   host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
   host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
   host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
@@ skipping 16 matching lines @@
 // Test that if a scrollable sublayer doesn't consume the scroll,
 // top controls should hide when scrolling down.
 TEST_F(LayerTreeHostImplTopControlsTest, TopControlsScrollableSublayer) {
   gfx::Size sub_content_size(100, 400);
   gfx::Size sub_content_layer_size(100, 300);
   SetupTopControlsAndScrollLayerWithVirtualViewport(
       gfx::Size(100, 50), gfx::Size(100, 100), gfx::Size(100, 100));
   DrawFrame();
 
   // Show top controls
-  EXPECT_EQ(top_controls_height_,
-            host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(1.f, host_impl_->active_tree()->CurrentTopControlsShownRatio());
 
   LayerImpl* outer_viewport_scroll_layer =
       host_impl_->active_tree()->OuterViewportScrollLayer();
   int id = outer_viewport_scroll_layer->id();
 
   scoped_ptr<LayerImpl> child =
       LayerImpl::Create(host_impl_->active_tree(), id + 2);
   scoped_ptr<LayerImpl> child_clip =
       LayerImpl::Create(host_impl_->active_tree(), id + 3);
 
@@ skipping 13 matching lines @@
   // Scroll 25px to hide top controls
   gfx::Vector2dF scroll_delta(0.f, 25.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
   host_impl_->ScrollEnd();
 
   // Top controls should be hidden
   EXPECT_EQ(scroll_delta.y(),
             top_controls_height_ -
-                host_impl_->active_tree()->total_top_controls_content_offset());
+                host_impl_->top_controls_manager()->ContentTopOffset());
 }
 
 // Ensure setting the top controls position explicitly using the setters on the
 // TreeImpl correctly affects the top controls manager and viewport bounds.
 TEST_F(LayerTreeHostImplTopControlsTest, PositionTopControlsExplicitly) {
   CreateHostImpl(settings_, CreateOutputSurface());
   SetupTopControlsAndScrollLayer();
   DrawFrame();
 
-  host_impl_->active_tree()->set_top_controls_delta(0.f);
-  host_impl_->active_tree()->set_top_controls_content_offset(30.f);
-  EXPECT_EQ(30.f, host_impl_->top_controls_manager()->ContentTopOffset());
-  EXPECT_EQ(-20.f, host_impl_->top_controls_manager()->ControlsTopOffset());
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(0.f);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushFromMainThread(
+      30.f / top_controls_height_);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushPendingToActive();
+  EXPECT_FLOAT_EQ(30.f, host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(-20.f,
+                  host_impl_->top_controls_manager()->ControlsTopOffset());
 
-  host_impl_->active_tree()->set_top_controls_delta(-30.f);
-  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
-  EXPECT_EQ(-50.f, host_impl_->top_controls_manager()->ControlsTopOffset());
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(0.f);
+  EXPECT_FLOAT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(-50.f,
+                  host_impl_->top_controls_manager()->ControlsTopOffset());
 
   host_impl_->DidChangeTopControlsPosition();
 
   // Now that top controls have moved, expect the clip to resize.
   LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
   EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
 }
 
 // Test that the top_controls delta and sent delta are appropriately
 // applied on sync tree activation. The total top controls offset shouldn't
 // change after the activation.
 TEST_F(LayerTreeHostImplTopControlsTest, ApplyDeltaOnTreeActivation) {
   CreateHostImpl(settings_, CreateOutputSurface());
   SetupTopControlsAndScrollLayer();
   DrawFrame();
 
-  host_impl_->sync_tree()->set_top_controls_content_offset(15.f);
-
-  host_impl_->active_tree()->set_top_controls_content_offset(20.f);
-  host_impl_->active_tree()->set_top_controls_delta(-20.f);
-  host_impl_->active_tree()->set_sent_top_controls_delta(-5.f);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushFromMainThread(
+      20.f / top_controls_height_);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushPendingToActive();
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(
+      15.f / top_controls_height_);
+  host_impl_->active_tree()
+      ->top_controls_shown_ratio()
+      ->PullDeltaForMainThread();
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(0.f);
+  host_impl_->sync_tree()->PushTopControlsFromMainThread(15.f /
+                                                         top_controls_height_);
 
   host_impl_->DidChangeTopControlsPosition();
   LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
   EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
   EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
-  EXPECT_EQ(0.f,
-      host_impl_->active_tree()->total_top_controls_content_offset());
 
   host_impl_->ActivateSyncTree();
 
   root_clip_ptr = host_impl_->active_tree()->root_layer();
   EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
   EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
 
-  EXPECT_EQ(0.f, host_impl_->active_tree()->sent_top_controls_delta());
-  EXPECT_EQ(-15.f, host_impl_->active_tree()->top_controls_delta());
-  EXPECT_EQ(15.f, host_impl_->active_tree()->top_controls_content_offset());
-  EXPECT_EQ(0.f,
-      host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_FLOAT_EQ(
+      -15.f, host_impl_->active_tree()->top_controls_shown_ratio()->Delta() *
+                 top_controls_height_);
+  EXPECT_FLOAT_EQ(
+      15.f,
+      host_impl_->active_tree()->top_controls_shown_ratio()->ActiveBase() *
+          top_controls_height_);
 }
 
 // Test that changing the top controls layout height is correctly applied to
 // the inner viewport container bounds. That is, the top controls layout
 // height is the amount that the inner viewport container was shrunk outside
 // the compositor to accommodate the top controls.
 TEST_F(LayerTreeHostImplTopControlsTest, TopControlsLayoutHeightChanged) {
   CreateHostImpl(settings_, CreateOutputSurface());
   SetupTopControlsAndScrollLayer();
   DrawFrame();
 
-  host_impl_->sync_tree()->set_top_controls_content_offset(50.f);
+  host_impl_->sync_tree()->PushTopControlsFromMainThread(1.f);
   host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
 
-  host_impl_->active_tree()->set_top_controls_content_offset(50.f);
-  host_impl_->active_tree()->set_top_controls_delta(-50.f);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushFromMainThread(
+      1.f);
+  host_impl_->active_tree()->top_controls_shown_ratio()->PushPendingToActive();
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(0.f);
 
   host_impl_->DidChangeTopControlsPosition();
   LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
   EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
   EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
 
   host_impl_->sync_tree()->root_layer()->SetBounds(
       gfx::Size(root_clip_ptr->bounds().width(),
                 root_clip_ptr->bounds().height() - 50.f));
 
   host_impl_->ActivateSyncTree();
 
   root_clip_ptr = host_impl_->active_tree()->root_layer();
   EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
 
   // The total bounds should remain unchanged since the bounds delta should
   // account for the difference between the layout height and the current
   // top controls offset.
   EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0.f, 50.f), root_clip_ptr->bounds_delta());
 
-  host_impl_->active_tree()->set_top_controls_delta(0.f);
+  host_impl_->active_tree()->SetCurrentTopControlsShownRatio(1.f);
   host_impl_->DidChangeTopControlsPosition();
 
+  EXPECT_EQ(1.f, host_impl_->top_controls_manager()->TopControlsShownRatio());
+  EXPECT_EQ(50.f, host_impl_->top_controls_manager()->TopControlsHeight());
   EXPECT_EQ(50.f, host_impl_->top_controls_manager()->ContentTopOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0.f, 0.f), root_clip_ptr->bounds_delta());
   EXPECT_EQ(gfx::Size(viewport_size_.width(), viewport_size_.height() - 50.f),
             root_clip_ptr->bounds());
 }
 
 // Test that showing/hiding the top controls when the viewport is fully scrolled
 // doesn't incorrectly change the viewport offset due to clamping from changing
 // viewport bounds.
 TEST_F(LayerTreeHostImplTopControlsTest, TopControlsViewportOffsetClamping) {
   SetupTopControlsAndScrollLayerWithVirtualViewport(
       gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
   DrawFrame();
 
-  EXPECT_EQ(top_controls_height_,
-            host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(1.f, host_impl_->active_tree()->CurrentTopControlsShownRatio());
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
 
   // Scroll the viewports to max scroll offset.
   outer_scroll->SetScrollDelta(gfx::Vector2dF(0, 200.f));
   inner_scroll->SetScrollDelta(gfx::Vector2dF(100, 100.f));
 
   gfx::ScrollOffset viewport_offset =
       host_impl_->active_tree()->TotalScrollOffset();
   EXPECT_EQ(host_impl_->active_tree()->TotalMaxScrollOffset(), viewport_offset);
 
   // Hide the top controls by 25px.
   gfx::Vector2dF scroll_delta(0.f, 25.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
 
   // scrolling down at the max extents no longer hides the top controls
-  EXPECT_EQ(0.f,
-            top_controls_height_ -
-                host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(1.f, host_impl_->active_tree()->CurrentTopControlsShownRatio());
 
   // forcefully hide the top controls by 25px
   host_impl_->top_controls_manager()->ScrollBy(scroll_delta);
   host_impl_->ScrollEnd();
 
-  EXPECT_EQ(scroll_delta.y(),
-            top_controls_height_ -
-                host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_FLOAT_EQ(scroll_delta.y(),
+                  top_controls_height_ -
+                      host_impl_->top_controls_manager()->ContentTopOffset());
 
   inner_scroll->ClampScrollToMaxScrollOffset();
   outer_scroll->ClampScrollToMaxScrollOffset();
 
   // We should still be fully scrolled.
   EXPECT_EQ(host_impl_->active_tree()->TotalMaxScrollOffset(),
             host_impl_->active_tree()->TotalScrollOffset());
 
   viewport_offset = host_impl_->active_tree()->TotalScrollOffset();
 
@@ skipping 15 matching lines @@
             host_impl_->active_tree()->TotalScrollOffset());
 }
 
 // Test that the top controls coming in and out maintains the same aspect ratio
 // between the inner and outer viewports.
 TEST_F(LayerTreeHostImplTopControlsTest, TopControlsAspectRatio) {
   SetupTopControlsAndScrollLayerWithVirtualViewport(
       gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
   DrawFrame();
 
-  EXPECT_EQ(top_controls_height_,
-            host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_FLOAT_EQ(top_controls_height_,
+                  host_impl_->top_controls_manager()->ContentTopOffset());
 
   gfx::Vector2dF scroll_delta(0.f, 25.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
   host_impl_->ScrollEnd();
 
-  EXPECT_EQ(scroll_delta.y(),
-            top_controls_height_ -
-                host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_FLOAT_EQ(scroll_delta.y(),
+                  top_controls_height_ -
+                      host_impl_->top_controls_manager()->ContentTopOffset());
 
   // Top controls were hidden by 25px so the inner viewport should have expanded
   // by that much.
   LayerImpl* outer_container =
             host_impl_->active_tree()->OuterViewportContainerLayer();
   LayerImpl* inner_container =
             host_impl_->active_tree()->InnerViewportContainerLayer();
   EXPECT_EQ(gfx::Size(100, 100+25), inner_container->BoundsForScrolling());
 
   // Outer viewport should match inner's aspect ratio. The bounds are ceiled.
   float aspect_ratio = inner_container->BoundsForScrolling().width() /
                        inner_container->BoundsForScrolling().height();
   gfx::Size expected = gfx::ToCeiledSize(gfx::SizeF(200, 200 / aspect_ratio));
   EXPECT_EQ(expected, outer_container->BoundsForScrolling());
   EXPECT_EQ(expected,
             host_impl_->InnerViewportScrollLayer()->BoundsForScrolling());
 }
 
 // Test that scrolling the outer viewport affects the top controls.
 TEST_F(LayerTreeHostImplTopControlsTest, TopControlsScrollOuterViewport) {
   SetupTopControlsAndScrollLayerWithVirtualViewport(
       gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
   DrawFrame();
 
   EXPECT_EQ(top_controls_height_,
-            host_impl_->active_tree()->total_top_controls_content_offset());
+            host_impl_->top_controls_manager()->ContentTopOffset());
 
   // Send a gesture scroll that will scroll the outer viewport, make sure the
   // top controls get scrolled.
   gfx::Vector2dF scroll_delta(0.f, 15.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
   EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
             host_impl_->CurrentlyScrollingLayer());
   host_impl_->ScrollEnd();
 
-  EXPECT_EQ(scroll_delta.y(),
-            top_controls_height_ -
-                host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_FLOAT_EQ(scroll_delta.y(),
+                  top_controls_height_ -
+                      host_impl_->top_controls_manager()->ContentTopOffset());
 
   scroll_delta = gfx::Vector2dF(0.f, 50.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
 
-  EXPECT_EQ(0, host_impl_->active_tree()->total_top_controls_content_offset());
+  EXPECT_EQ(0, host_impl_->top_controls_manager()->ContentTopOffset());
   EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
             host_impl_->CurrentlyScrollingLayer());
 
   host_impl_->ScrollEnd();
 
   // Position the viewports such that the inner viewport will be scrolled.
   gfx::Vector2dF inner_viewport_offset(0.f, 25.f);
   host_impl_->OuterViewportScrollLayer()->SetScrollDelta(gfx::Vector2dF());
   host_impl_->InnerViewportScrollLayer()->SetScrollDelta(inner_viewport_offset);
 
   scroll_delta = gfx::Vector2dF(0.f, -65.f);
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
 
   EXPECT_EQ(top_controls_height_,
-            host_impl_->active_tree()->total_top_controls_content_offset());
-  EXPECT_EQ(
+            host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(
       inner_viewport_offset.y() + (scroll_delta.y() + top_controls_height_),
       host_impl_->InnerViewportScrollLayer()->ScrollDelta().y());
 
   host_impl_->ScrollEnd();
 }
 
 TEST_F(LayerTreeHostImplTopControlsTest,
        ScrollNonScrollableRootWithTopControls) {
   CreateHostImpl(settings_, CreateOutputSurface());
   SetupTopControlsAndScrollLayer();
@@ skipping 12 matching lines @@
 
   host_impl_->ScrollEnd();
 
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
 
   float scroll_increment_y = -25.f;
   host_impl_->top_controls_manager()->ScrollBegin();
   host_impl_->top_controls_manager()->ScrollBy(
       gfx::Vector2dF(0.f, scroll_increment_y));
-  EXPECT_EQ(-scroll_increment_y,
-            host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(-scroll_increment_y,
+                  host_impl_->top_controls_manager()->ContentTopOffset());
   // Now that top controls have moved, expect the clip to resize.
   EXPECT_EQ(gfx::Size(viewport_size_.width(),
                       viewport_size_.height() + scroll_increment_y),
             root_clip_ptr->bounds());
 
   host_impl_->top_controls_manager()->ScrollBy(
       gfx::Vector2dF(0.f, scroll_increment_y));
   host_impl_->top_controls_manager()->ScrollEnd();
-  EXPECT_EQ(-2 * scroll_increment_y,
-            host_impl_->top_controls_manager()->ContentTopOffset());
+  EXPECT_FLOAT_EQ(-2 * scroll_increment_y,
+                  host_impl_->top_controls_manager()->ContentTopOffset());
   // Now that top controls have moved, expect the clip to resize.
   EXPECT_EQ(clip_size_, root_clip_ptr->bounds());
 
   host_impl_->ScrollEnd();
 
   // Verify the layer is once-again non-scrollable.
   EXPECT_EQ(
       gfx::ScrollOffset(),
       host_impl_->active_tree()->InnerViewportScrollLayer()->MaxScrollOffset());
 
@@ skipping 4337 matching lines @@
   }
 }
 
 class LayerTreeHostImplWithTopControlsTest : public LayerTreeHostImplTest {
  public:
   void SetUp() override {
     LayerTreeSettings settings = DefaultSettings();
     settings.calculate_top_controls_position = true;
     CreateHostImpl(settings, CreateOutputSurface());
     host_impl_->active_tree()->set_top_controls_height(top_controls_height_);
-    host_impl_->active_tree()->set_top_controls_delta(top_controls_height_);
-    host_impl_->top_controls_manager()->SetTopControlsHeight(
-        top_controls_height_);
+    host_impl_->sync_tree()->set_top_controls_height(top_controls_height_);
+    host_impl_->active_tree()->SetCurrentTopControlsShownRatio(1.f);
   }
 
  protected:
   static const int top_controls_height_;
 };
 
 const int LayerTreeHostImplWithTopControlsTest::top_controls_height_ = 50;
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, NoIdleAnimations) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100))
       ->PushScrollOffsetFromMainThread(gfx::ScrollOffset(0, 10));
   host_impl_->Animate(base::TimeTicks());
   EXPECT_FALSE(did_request_redraw_);
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsHeightIsCommitted) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   EXPECT_FALSE(did_request_redraw_);
   host_impl_->CreatePendingTree();
   host_impl_->sync_tree()->set_top_controls_height(100);
   host_impl_->ActivateSyncTree();
-  EXPECT_EQ(100, host_impl_->top_controls_manager()->top_controls_height());
+  EXPECT_EQ(100, host_impl_->top_controls_manager()->TopControlsHeight());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest,
        TopControlsStayFullyVisibleOnHeightChange) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
-  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());
+  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ControlsTopOffset());
 
   host_impl_->CreatePendingTree();
   host_impl_->sync_tree()->set_top_controls_height(0);
   host_impl_->ActivateSyncTree();
-  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());
+  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ControlsTopOffset());
 
   host_impl_->CreatePendingTree();
   host_impl_->sync_tree()->set_top_controls_height(50);
   host_impl_->ActivateSyncTree();
-  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());
+  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ControlsTopOffset());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationScheduling) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100))
       ->PushScrollOffsetFromMainThread(gfx::ScrollOffset(0, 10));
   host_impl_->DidChangeTopControlsPosition();
   EXPECT_TRUE(did_request_animate_);
   EXPECT_TRUE(did_request_redraw_);
 }
 
@@ skipping 716 matching lines @@
   // surface.
   EXPECT_EQ(0, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_EQ(1, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_LE(1, num_lost_surfaces_);
 }
 
 }  // namespace
 }  // namespace cc