cc: Avoid duplicate work when computing draw properties using property trees

cc/layers/render_surface_draw_properties.cc

Index: cc/layers/render_surface_draw_properties.cc
diff --git a/cc/layers/render_surface_draw_properties.cc b/cc/layers/render_surface_draw_properties.cc
new file mode 100644
index 0000000000000000000000000000000000000000..22131fd0424db41bafb504742376fff31ff5835f
--- /dev/null
+++ b/cc/layers/render_surface_draw_properties.cc
@@ -0,0 +1,14 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/layers/render_surface_draw_properties.h"
+
+namespace cc {
+
+RenderSurfaceDrawProperties::RenderSurfaceDrawProperties()
+    : draw_opacity(0.f), is_clipped(false) {}
+
+RenderSurfaceDrawProperties::~RenderSurfaceDrawProperties() {}
+
+}  // namespace cc