cc: Split RasterTilePriorityQueue into required and all based on type.

cc/resources/raster_tile_priority_queue_all.h

Index: cc/resources/raster_tile_priority_queue_all.h
diff --git a/cc/resources/raster_tile_priority_queue.h b/cc/resources/raster_tile_priority_queue_all.h
similarity index 65%
copy from cc/resources/raster_tile_priority_queue.h
copy to cc/resources/raster_tile_priority_queue_all.h
index 65c924798a8338de2e6002254a2c481f8fc742ca..73c946560990d1061807088a44ecb044b0ca47d7 100644
--- a/cc/resources/raster_tile_priority_queue.h
+++ b/cc/resources/raster_tile_priority_queue_all.h
@@ -1,9 +1,9 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2015 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_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_H_
-#define CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_H_
+#ifndef CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_ALL_H_
+#define CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_ALL_H_
 
 #include <set>
 #include <utility>
@@ -11,25 +11,19 @@
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/picture_layer_impl.h"
+#include "cc/resources/raster_tile_priority_queue.h"
 #include "cc/resources/tile_priority.h"
 #include "cc/resources/tiling_set_raster_queue.h"
 
 namespace cc {
 
-// TODO(vmpstr): Consider virtualizing this and adding ::Create with the
-// parameters of ::Build that would create a simpler queue for required only
-// tiles (ie, there's no need for the heap if all we're interested in are the
-// required tiles.
-class CC_EXPORT RasterTilePriorityQueue {
+class CC_EXPORT RasterTilePriorityQueueAll : public RasterTilePriorityQueue {
  public:
-  enum class Type { ALL, REQUIRED_FOR_ACTIVATION, REQUIRED_FOR_DRAW };
-
   class PairedTilingSetQueue {
    public:
     PairedTilingSetQueue();
     PairedTilingSetQueue(const PictureLayerImpl::Pair& layer_pair,
-                         TreePriority tree_priority,
-                         Type type);
+                         TreePriority tree_priority);
     ~PairedTilingSetQueue();
 
     bool IsEmpty() const;
@@ -57,28 +51,28 @@ class CC_EXPORT RasterTilePriorityQueue {
     std::set<const Tile*> returned_tiles_for_debug_;
   };
 
-  RasterTilePriorityQueue();
-  ~RasterTilePriorityQueue();
-
-  void Build(const std::vector<PictureLayerImpl::Pair>& paired_layers,
-             TreePriority tree_priority,
-             Type type);
-  void Reset();
+  RasterTilePriorityQueueAll();
+  ~RasterTilePriorityQueueAll() override;
 
-  bool IsEmpty() const;
-  Tile* Top();
-  void Pop();
+  bool IsEmpty() const override;
+  Tile* Top() override;
+  void Pop() override;
 
  private:
+  friend class RasterTilePriorityQueue;
+
+  void Build(const std::vector<PictureLayerImpl::Pair>& paired_layers,
+             TreePriority tree_priority);
+
   // TODO(vmpstr): This is potentially unnecessary if it becomes the case that
   // PairedTilingSetQueue is fast enough to copy. In that case, we can use
   // objects directly (ie std::vector<PairedTilingSetQueue>.
   ScopedPtrVector<PairedTilingSetQueue> paired_queues_;
   TreePriority tree_priority_;
 
-  DISALLOW_COPY_AND_ASSIGN(RasterTilePriorityQueue);
+  DISALLOW_COPY_AND_ASSIGN(RasterTilePriorityQueueAll);
 };
 
 }  // namespace cc
 
-#endif  // CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_H_
+#endif  // CC_RESOURCES_RASTER_TILE_PRIORITY_QUEUE_ALL_H_