cc: Move --num-raster-threads setting to LayerTreeSettings.

cc/layer_tree_host.h

 // 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_HOST_H_
 #define CC_LAYER_TREE_HOST_H_
 
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 70 matching lines @@
     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;
 };
 
 // Provides information on an Impl's rendering capabilities back to the LayerTreeHost
 struct CC_EXPORT RendererCapabilities {
     RendererCapabilities();
@@ skipping 213 matching lines @@
     size_t m_partialTextureUpdateRequests;
 
     static bool s_needsFilterContext;
 
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_H_