cc: Move TryScroll from LayerImpl to LayerTreeHostImpl

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 f2da25e849acc6394cd7011ae8f8b22378155c11..bb65c02a8d2ce989e3896b2c60fe047d7a9a96ca 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -860,12 +860,14 @@ TEST_F(LayerTreeHostImplTest, FlingOnlyWhenScrollingTouchpad) {
 TEST_F(LayerTreeHostImplTest, NoFlingWhenScrollingOnMain) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
-  DrawFrame();
   LayerImpl* root = host_impl_->active_tree()->root_layer();
 
   root->set_main_thread_scrolling_reasons(
       MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects);
 
+  SetNeedsRebuildPropertyTrees();
+  DrawFrame();
+
   // Start scrolling a layer
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::GESTURE);
@@ -883,11 +885,12 @@ TEST_F(LayerTreeHostImplTest, NoFlingWhenScrollingOnMain) {
 TEST_F(LayerTreeHostImplTest, ShouldScrollOnMainThread) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
-  DrawFrame();
   LayerImpl* root = host_impl_->active_tree()->root_layer();
 
   root->set_main_thread_scrolling_reasons(
       MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects);
+  SetNeedsRebuildPropertyTrees();
+  DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
@@ -909,6 +912,7 @@ TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionBasic) {
   LayerImpl* root = host_impl_->active_tree()->root_layer();
   root->SetNonFastScrollableRegion(gfx::Rect(0, 0, 50, 50));
 
+  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // All scroll types inside the non-fast scrollable region should fail.
@@ -966,6 +970,7 @@ TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionWithOffset) {
   root->SetPosition(gfx::PointF(-25.f, 0.f));
   root->SetDrawsContent(true);
 
+  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // This point would fall into the non-fast scrollable region except that we've