cc: Commit directly to active tree when using single thread.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 441346dcd6c2030ec8ff131f69616f3f93dcfe99..bb315e79d02c152d57cb9ecb4dc8d343eee4acd1 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -142,7 +142,9 @@ class LayerTreeHostTestReadyToActivateNonEmpty
   FakeContentLayerClient client_;
 };
 
-SINGLE_AND_MULTI_THREAD_IMPL_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
+// Multi-thread only because in single thread the commit goes directly to the
+// active tree, so notify ready to activate is skipped.
+MULTI_THREAD_IMPL_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
 
 // Test if the LTHI receives ReadyToDraw notifications from the TileManager when
 // no raster tasks get scheduled.
@@ -5199,7 +5201,7 @@ class LayerTreeHostTestGpuRasterizationForced : public LayerTreeHostTest {
   }
 
   void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
-    EXPECT_TRUE(host_impl->pending_tree()->use_gpu_rasterization());
+    EXPECT_TRUE(host_impl->sync_tree()->use_gpu_rasterization());
     EXPECT_TRUE(host_impl->use_gpu_rasterization());
   }