Revert "Round the scroll offset synced back to main instead of flooring."

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 b2fd2e17215b8e00a617b949a2a20be090cd5e37..5f4cb83611447f704a65bc0721866064475ae4c7 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -61,7 +61,6 @@
 #include "cc/test/test_compositor_frame_sink.h"
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/test/test_web_graphics_context_3d.h"
-#include "cc/trees/draw_property_utils.h"
 #include "cc/trees/effect_node.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_impl.h"
@@ -2256,53 +2255,6 @@ TEST_F(LayerTreeHostImplTest, PinchGesture) {
   }
 }
 
-TEST_F(LayerTreeHostImplTest, SyncSubpixelScrollDelta) {
-  SetupScrollAndContentsLayers(gfx::Size(100, 100));
-  host_impl_->SetViewportSize(gfx::Size(50, 50));
-  DrawFrame();
-
-  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
-  DCHECK(scroll_layer);
-
-  float min_page_scale = 1.f;
-  float max_page_scale = 4.f;
-
-  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
-                                                         max_page_scale);
-  SetScrollOffsetDelta(scroll_layer, gfx::Vector2d());
-  scroll_layer->layer_tree_impl()
-      ->property_trees()
-      ->scroll_tree.CollectScrollDeltasForTesting();
-  scroll_layer->layer_tree_impl()
-      ->property_trees()
-      ->scroll_tree.UpdateScrollOffsetBaseForTesting(scroll_layer->id(),
-                                                     gfx::ScrollOffset(0, 20));
-
-  float page_scale_delta = 1.f;
-  host_impl_->ScrollBegin(BeginState(gfx::Point(10, 10)).get(),
-                          InputHandler::TOUCHSCREEN);
-  host_impl_->PinchGestureBegin();
-  host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(10, 10));
-  host_impl_->ScrollBy(
-      UpdateState(gfx::Point(10, 10), gfx::Vector2dF(0, -1.001f)).get());
-  host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(10, 9));
-  host_impl_->PinchGestureEnd();
-  host_impl_->ScrollEnd(EndState().get());
-
-  std::unique_ptr<ScrollAndScaleSet> scroll_info =
-      host_impl_->ProcessScrollDeltas();
-  EXPECT_EQ(scroll_info->page_scale_delta, page_scale_delta);
-  EXPECT_TRUE(ScrollInfoContains(*scroll_info, scroll_layer->id(),
-                                 gfx::Vector2d(0, -1)));
-
-  // Verify this scroll delta is consistent with the snapped position of the
-  // scroll layer.
-  draw_property_utils::ComputeTransforms(
-      &scroll_layer->layer_tree_impl()->property_trees()->transform_tree);
-  EXPECT_VECTOR_EQ(gfx::Vector2dF(0.f, -19.f),
-                   scroll_layer->ScreenSpaceTransform().To2dTranslation());
-}
-
 TEST_F(LayerTreeHostImplTest, PageScaleAnimation) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
@@ -5740,12 +5692,12 @@ TEST_F(LayerTreeHostImplTest, ScrollPerspectiveTransformedLayer) {
   gfx::Vector2d expected_scroll_deltas[4];
   // Perspective affects the vertical delta by a different
   // amount depending on the vertical position of the |viewport_point|.
-  expected_scroll_deltas[0] = gfx::Vector2d(2, 9);
+  expected_scroll_deltas[0] = gfx::Vector2d(2, 8);
   expected_scroll_deltas[1] = gfx::Vector2d(1, 4);
   // Deltas which start with the same vertical position of the
   // |viewport_point| are subject to identical perspective effects.
-  expected_scroll_deltas[2] = gfx::Vector2d(5, 0);
-  expected_scroll_deltas[3] = gfx::Vector2d(5, 0);
+  expected_scroll_deltas[2] = gfx::Vector2d(4, 0);
+  expected_scroll_deltas[3] = gfx::Vector2d(4, 0);
 
   gfx::Point viewport_point(1, 1);