cc: Start using raster/eviction iterators in tile manager

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 30f4730423e9ce616c61a614c287b38897752bf9..89cab0b8f65d09e0ed643c23fc5f505f40dd5e10 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -21,7 +21,6 @@
 #include "cc/resources/managed_tile_state.h"
 #include "cc/resources/memory_history.h"
 #include "cc/resources/picture_pile_impl.h"
-#include "cc/resources/prioritized_tile_set.h"
 #include "cc/resources/rasterizer.h"
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/tile.h"
@@ -204,10 +203,8 @@ class CC_EXPORT TileManager : public RasterizerClient,
       ManagedTileState::TileVersion& tile_version =
           mts.tile_versions[HIGH_QUALITY_RASTER_MODE];
 
-      tile_version.resource_ = resource_pool_->AcquireResource(gfx::Size(1, 1));
-
-      bytes_releasable_ += BytesConsumedIfAllocated(tiles[i]);
-      ++resources_releasable_;
+      tile_version.resource_ =
+          resource_pool_->AcquireResource(tiles[i]->size());
     }
   }
 
@@ -222,12 +219,7 @@ class CC_EXPORT TileManager : public RasterizerClient,
 
   void SetGlobalStateForTesting(
       const GlobalStateThatImpactsTilePriority& state) {
-    // Soft limit is used for resource pool such that
-    // memory returns to soft limit after going over.
-    if (state != global_state_) {
-      global_state_ = state;
-      prioritized_tiles_dirty_ = true;
-    }
+    global_state_ = state;
   }
 
   void SetRasterizerForTesting(Rasterizer* rasterizer);
@@ -241,13 +233,10 @@ class CC_EXPORT TileManager : public RasterizerClient,
               Rasterizer* rasterizer,
               RenderingStatsInstrumentation* rendering_stats_instrumentation);
 
-  // Methods called by Tile
-  friend class Tile;
-  void DidChangeTilePriority(Tile* tile);
-
   void CleanUpReleasedTiles();
 
   // Overriden from RefCountedManager<Tile>:
+  friend class Tile;
   virtual void Release(Tile* tile) OVERRIDE;
 
   // Overriden from RasterizerClient:
@@ -262,11 +251,30 @@ class CC_EXPORT TileManager : public RasterizerClient,
   virtual void ScheduleTasks(
       const TileVector& tiles_that_need_to_be_rasterized);
 
-  void AssignGpuMemoryToTiles(PrioritizedTileSet* tiles,
-                              TileVector* tiles_that_need_to_be_rasterized);
-  void GetTilesWithAssignedBins(PrioritizedTileSet* tiles);
+  void AssignGpuMemoryToTiles(TileVector* tiles_that_need_to_be_rasterized);
 
  private:
+  class MemoryUsage {
+   public:
+    MemoryUsage();
+    MemoryUsage(int64 memory_bytes, int resource_count);
+
+    static MemoryUsage FromConfig(const gfx::Size& size, ResourceFormat format);
+    static MemoryUsage FromTile(const Tile* tile);
+
+    MemoryUsage& operator+=(const MemoryUsage& other);
+    MemoryUsage& operator-=(const MemoryUsage& other);
+    MemoryUsage operator-(const MemoryUsage& other);
+
+    bool Exceeds(const MemoryUsage& limit) const;
+
+    int64 memory_bytes() const { return memory_bytes_; }
+
+   private:
+    int64 memory_bytes_;
+    int resource_count_;
+  };
+
   void OnImageDecodeTaskCompleted(int layer_id,
                                   SkPixelRef* pixel_ref,
                                   bool was_canceled);
@@ -276,11 +284,6 @@ class CC_EXPORT TileManager : public RasterizerClient,
                              const PicturePileImpl::Analysis& analysis,
                              bool was_canceled);
 
-  inline size_t BytesConsumedIfAllocated(const Tile* tile) const {
-    return Resource::MemorySizeBytes(tile->size(),
-                                     resource_pool_->resource_format());
-  }
-
   void FreeResourceForTile(Tile* tile, RasterMode mode);
   void FreeResourcesForTile(Tile* tile);
   void FreeUnusedResourcesForTile(Tile* tile);
@@ -289,8 +292,16 @@ class CC_EXPORT TileManager : public RasterizerClient,
                                                        SkPixelRef* pixel_ref);
   scoped_refptr<RasterTask> CreateRasterTask(Tile* tile);
   scoped_ptr<base::Value> GetMemoryRequirementsAsValue() const;
-  void UpdatePrioritizedTileSetIfNeeded();
 
+  bool FreeTileResourcesUntilUsageIsWithinLimit(EvictionTileIterator* iterator,
+                                                const MemoryUsage& limit,
+                                                MemoryUsage* usage);
+  bool FreeTileResourcesWithLowerPriorityUntilUsageIsWithinLimit(
+      EvictionTileIterator* iterator,
+      const MemoryUsage& limit,
+      const TilePriority& other_priority,
+      MemoryUsage* usage);
+  bool TilePriorityViolatesMemoryPolicy(const TilePriority& priority);
   bool IsReadyToActivate() const;
   void CheckIfReadyToActivate();
 
@@ -303,19 +314,8 @@ class CC_EXPORT TileManager : public RasterizerClient,
   typedef base::hash_map<Tile::Id, Tile*> TileMap;
   TileMap tiles_;
 
-  PrioritizedTileSet prioritized_tiles_;
-  bool prioritized_tiles_dirty_;
-
-  bool all_tiles_that_need_to_be_rasterized_have_memory_;
-  bool all_tiles_required_for_activation_have_memory_;
-
-  size_t memory_required_bytes_;
-  size_t memory_nice_to_have_bytes_;
-
-  size_t bytes_releasable_;
-  size_t resources_releasable_;
+  bool all_tiles_that_need_to_be_rasterized_are_scheduled_;
 
-  bool ever_exceeded_memory_budget_;
   MemoryHistory::Entry memory_stats_from_last_assign_;
 
   RenderingStatsInstrumentation* rendering_stats_instrumentation_;