cc: Add checker-imaging support to TileManager.

cc/tiles/tile_manager_settings.cc

Index: cc/tiles/tile_manager_settings.cc
diff --git a/cc/tiles/tile_manager_settings.cc b/cc/tiles/tile_manager_settings.cc
new file mode 100644
index 0000000000000000000000000000000000000000..754234d654dedf21aed7b29a688879e0d3847022
--- /dev/null
+++ b/cc/tiles/tile_manager_settings.cc
@@ -0,0 +1,16 @@
+// Copyright 2017 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/tiles/tile_manager_settings.h"
+
+namespace cc {
+
+TileManagerSettings::TileManagerSettings() = default;
+
+TileManagerSettings::TileManagerSettings(const TileManagerSettings& other) =
+    default;
+
+TileManagerSettings::~TileManagerSettings() {}
+
+}  // namespace cc