[cc] Route LayerImpl::layerTreeHostImpl() calls through LayerTreeImpl

cc/layer_tree_settings.h

Index: cc/layer_tree_settings.h
diff --git a/cc/layer_tree_settings.h b/cc/layer_tree_settings.h
new file mode 100644
index 0000000000000000000000000000000000000000..06c8b8c672d3eae0c8173eace327e54620287800
--- /dev/null
+++ b/cc/layer_tree_settings.h
@@ -0,0 +1,41 @@
+// Copyright 2011 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.
+
+#ifndef CC_LAYER_TREE_SETTINGS_H_
+#define CC_LAYER_TREE_SETTINGS_H_
+
+#include "base/basictypes.h"
+#include "cc/cc_export.h"
+#include "cc/layer_tree_debug_state.h"
+#include "ui/gfx/size.h"
+
+namespace cc {
+
+class CC_EXPORT LayerTreeSettings {
+ public:
+  LayerTreeSettings();
+  ~LayerTreeSettings();
+
+  bool acceleratePainting;
+  bool implSidePainting;
+  bool renderVSyncEnabled;
+  bool perTilePaintingEnabled;
+  bool partialSwapEnabled;
+  bool acceleratedAnimationEnabled;
+  bool pageScalePinchZoomEnabled;
+  bool backgroundColorInsteadOfCheckerboard;
+  bool showOverdrawInTracing;
+  double refreshRate;
+  size_t maxPartialTextureUpdates;
+  size_t numRasterThreads;
+  gfx::Size defaultTileSize;
+  gfx::Size maxUntiledLayerSize;
+  gfx::Size minimumOcclusionTrackingSize;
+
+  LayerTreeDebugState initialDebugState;
+};
+
+}  // namespace cc
+
+#endif  // CC_LAYER_TREE_SETTINGS_H_