[android] Remove unused scroll delta in TopControls

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index 5694c01aaa37565bec2f4254a0a41db9cb8092da..693d42e309dba89e677983e2a9bfbfd9b478f189 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -7198,6 +7198,54 @@ TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationAfterScroll) {
   EXPECT_FALSE(host_impl_->top_controls_manager()->animation());
 }
 
+TEST_F(LayerTreeHostImplWithTopControlsTest,
+       TopControlsScrollDeltaInOverScroll) {
+  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->SetViewportSize(gfx::Size(100, 100));
+  host_impl_->top_controls_manager()->UpdateTopControlsState(
+      BOTH, SHOWN, false);
+  DrawFrame();
+
+  EXPECT_EQ(InputHandler::ScrollStarted,
+            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
+  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
+
+  float offset = 50;
+  EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)));
+  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
+  EXPECT_EQ(gfx::Vector2dF().ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+
+  EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)));
+  EXPECT_EQ(gfx::Vector2dF(0, offset).ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+
+  EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)));
+  EXPECT_EQ(gfx::Vector2dF(0, scroll_layer->MaxScrollOffset().y()).ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+
+  float overscrollamount = 10;
+  EXPECT_FALSE(
+      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, overscrollamount)));
+  EXPECT_EQ(gfx::Vector2dF(0, 2 * offset).ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+  EXPECT_EQ(gfx::Vector2dF(0, overscrollamount).ToString(),
+            host_impl_->accumulated_root_overscroll().ToString());
+
+  EXPECT_TRUE(
+      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -2 * offset)));
+  EXPECT_EQ(gfx::Vector2dF(0, 0).ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
+
+  EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -offset)));
+  EXPECT_EQ(gfx::Vector2dF(0, 0).ToString(),
+            scroll_layer->TotalScrollOffset().ToString());
+  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
+
+  host_impl_->ScrollEnd();
+}
+
 class LayerTreeHostImplVirtualViewportTest : public LayerTreeHostImplTest {
  public:
   void SetupVirtualViewportLayers(const gfx::Size& content_size,