cc: Low quality support for low res tiles

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index d22b78e4b3c592dfeeee8b2d592018a3f014e6b0..862382024f0ed5b925c04f7a11df7fa04e65f504 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -24,6 +24,17 @@ class ResourceProvider;
 class Tile;
 class TileVersion;
 
+// Low quality implies no lcd test;
+// high quality implies lcd text.
+// Note that the order of these matters, from "better" to "worse" in terms of
+// quality.
+enum TileRasterMode {
+  HIGH_QUALITY_RASTER_MODE = 0,
+  HIGH_QUALITY_NO_LCD_RASTER_MODE = 1,
+  LOW_QUALITY_RASTER_MODE = 2,
+  NUM_RASTER_MODES = 3
+};
+
 class CC_EXPORT TileManagerClient {
  public:
   virtual void ScheduleManageTiles() = 0;
@@ -124,12 +135,16 @@ class CC_EXPORT TileManager {
       int layer_id;
       const void* tile_id;
       int source_frame_number;
+      TileRasterMode raster_mode;
   };
 
   void AssignBinsToTiles();
   void SortTiles();
+  TileRasterMode DetermineRasterMode(const Tile* tile) const;
   void AssignGpuMemoryToTiles();
+  void FreeResourceForTile(Tile* tile, TileRasterMode mode);
   void FreeResourcesForTile(Tile* tile);
+  void FreeUnusedResourcesForTile(Tile* tile);
   void ScheduleManageTiles() {
     if (manage_tiles_pending_)
       return;
@@ -149,6 +164,7 @@ class CC_EXPORT TileManager {
       scoped_refptr<Tile> tile,
       scoped_ptr<ResourcePool::Resource> resource,
       PicturePileImpl::Analysis* analysis,
+      TileRasterMode raster_mode,
       bool was_canceled);
   void DidFinishTileInitialization(Tile* tile);
   void DidTileTreeBinChange(Tile* tile,