cc: Remove low quality mode and cleanup tile versions.

cc/resources/managed_tile_state.h

Index: cc/resources/managed_tile_state.h
diff --git a/cc/resources/managed_tile_state.h b/cc/resources/managed_tile_state.h
index faa7c63a3b2ce6cf82e12ca2a6f45b07fcf4794e..44784eed6c8cbcd77414a38776ea49273283dee3 100644
--- a/cc/resources/managed_tile_state.h
+++ b/cc/resources/managed_tile_state.h
@@ -7,7 +7,6 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/resources/platform_color.h"
-#include "cc/resources/raster_mode.h"
 #include "cc/resources/rasterizer.h"
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/resource_provider.h"
@@ -38,12 +37,12 @@ scoped_ptr<base::Value> ManagedTileBinAsValue(ManagedTileBin bin);
 // managed by the TileManager.
 class CC_EXPORT ManagedTileState {
  public:
-  class CC_EXPORT TileVersion {
+  class CC_EXPORT TileDrawInfo {
    public:
     enum Mode { RESOURCE_MODE, SOLID_COLOR_MODE, PICTURE_PILE_MODE };
 
-    TileVersion();
-    ~TileVersion();
+    TileDrawInfo();
+    ~TileDrawInfo();
 
     Mode mode() const { return mode_; }
 
@@ -107,8 +106,7 @@ class CC_EXPORT ManagedTileState {
   void AsValueInto(base::debug::TracedValue* dict) const;
 
   // Persisted state: valid all the time.
-  TileVersion tile_versions[NUM_RASTER_MODES];
-  RasterMode raster_mode;
+  TileDrawInfo draw_info_;
 
   ManagedTileBin bin;