cc: Move gpu rasterization flag from tree-impl to tree-host-impl.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index d9cab33cef74c5932c7ae035a5f2fed42b163382..5c7dbd5f0bd414b6ec43912092e00bb3963bafe7 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -348,10 +348,9 @@ void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
                                          max_page_scale_factor_);
   sync_tree->SetPageScaleDelta(page_scale_delta / sent_page_scale_delta);
 
-  sync_tree->SetUseGpuRasterization(UseGpuRasterization());
-
   sync_tree->PassSwapPromises(&swap_promise_list_);
 
+  host_impl->SetUseGpuRasterization(UseGpuRasterization());
   host_impl->SetViewportSize(device_viewport_size_);
   host_impl->SetOverdrawBottomHeight(overdraw_bottom_height_);
   host_impl->SetDeviceScaleFactor(device_scale_factor_);
@@ -434,6 +433,7 @@ scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
                                 rendering_stats_instrumentation_.get(),
                                 shared_bitmap_manager_,
                                 id_);
+  host_impl->SetUseGpuRasterization(UseGpuRasterization());
   shared_bitmap_manager_ = NULL;
   if (settings_.calculate_top_controls_position &&
       host_impl->top_controls_manager()) {