cc : Compute subtree has copy requests before property tree building

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 2e7457a49aac6600be861bf479eb244c545a3d17..cf667dd7c8b33314a41a1fa2d9ae48e43633ccf9 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -6508,7 +6508,7 @@ class LayerTreeHostTestUpdateCopyRequests : public LayerTreeHostTest {
   void WillCommit() override {
     switch (layer_tree_host()->SourceFrameNumber()) {
       case 1:
-        EXPECT_GT(root->num_copy_requests_in_target_subtree(), 0);
+        EXPECT_TRUE(root->has_copy_requests_in_target_subtree());
         break;
     }
   }
@@ -6531,7 +6531,7 @@ class LayerTreeHostTestUpdateCopyRequests : public LayerTreeHostTest {
         child->SetTransform(transform);
         break;
       case 3:
-        EXPECT_EQ(root->num_copy_requests_in_target_subtree(), 0);
+        EXPECT_FALSE(root->has_copy_requests_in_target_subtree());
         EndTest();
         break;
     }