Update from https://crrev.com/314320

cc/resources/tile_manager.h

 // Copyright 2012 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_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 21 matching lines @@
 }
 }
 
 namespace cc {
 class PictureLayerImpl;
 class Rasterizer;
 class ResourceProvider;
 
 class CC_EXPORT TileManagerClient {
  public:
-  // Returns the set of layers that the tile manager should consider for raster.
-  // TODO(vmpstr): Change the way we determine if we are ready to activate, so
-  // that this can be removed.
-  virtual const std::vector<PictureLayerImpl*>& GetPictureLayers() const = 0;
-
   // Called when all tiles marked as required for activation are ready to draw.
   virtual void NotifyReadyToActivate() = 0;
 
   // Called when all tiles marked as required for draw are ready to draw.
   virtual void NotifyReadyToDraw() = 0;
 
   // Called when the visible representation of a tile might have changed. Some
   // examples are:
   // - Tile version initialized.
   // - Tile resources freed.
   // - Tile marked for on-demand raster.
   virtual void NotifyTileStateChanged(const Tile* tile) = 0;
 
   // Given an empty raster tile priority queue, this will build a priority queue
   // that will return tiles in order in which they should be rasterized.
   // Note if the queue was previous built, Reset must be called on it.
   virtual scoped_ptr<RasterTilePriorityQueue> BuildRasterQueue(
       TreePriority tree_priority,
       RasterTilePriorityQueue::Type type) = 0;
 
   // Given an empty eviction tile priority queue, this will build a priority
   // queue that will return tiles in order in which they should be evicted.
   // Note if the queue was previous built, Reset must be called on it.
   virtual scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
       TreePriority tree_priority) = 0;
 
+  // Informs the client that due to the currently rasterizing (or scheduled to
+  // be rasterized) tiles, we will be in a position that will likely require a
+  // draw. This can be used to preemptively start a frame.
+  virtual void SetIsLikelyToRequireADraw(bool is_likely_to_require_a_draw) = 0;
+
  protected:
   virtual ~TileManagerClient() {}
 };
 
 struct RasterTaskCompletionStats {
   RasterTaskCompletionStats();
 
   size_t completed_count;
   size_t canceled_count;
 };
@@ skipping 86 matching lines @@
          ++it) {
       tiles.push_back(it->second);
     }
     return tiles;
   }
 
   void SetScheduledRasterTaskLimitForTesting(size_t limit) {
     scheduled_raster_task_limit_ = limit;
   }
 
+  bool IsReadyToActivate() const;
+  bool IsReadyToDraw() const;
+
  protected:
   TileManager(TileManagerClient* client,
               const scoped_refptr<base::SequencedTaskRunner>& task_runner,
               ResourcePool* resource_pool,
               TileTaskRunner* tile_task_runner,
               Rasterizer* rasterizer,
               size_t scheduled_raster_task_limit);
 
   void FreeResourcesForReleasedTiles();
   void CleanUpReleasedTiles();
@@ skipping 63 matching lines @@
       scoped_ptr<EvictionTilePriorityQueue> eviction_priority_queue,
       const MemoryUsage& limit,
       MemoryUsage* usage);
   scoped_ptr<EvictionTilePriorityQueue>
   FreeTileResourcesWithLowerPriorityUntilUsageIsWithinLimit(
       scoped_ptr<EvictionTilePriorityQueue> eviction_priority_queue,
       const MemoryUsage& limit,
       const TilePriority& oother_priority,
       MemoryUsage* usage);
   bool TilePriorityViolatesMemoryPolicy(const TilePriority& priority);
-  bool IsReadyToActivate() const;
-  bool IsReadyToDraw() const;
+  bool AreRequiredTilesReadyToDraw(RasterTilePriorityQueue::Type type) const;
   void NotifyReadyToActivate();
   void NotifyReadyToDraw();
   void CheckIfReadyToActivate();
   void CheckIfReadyToDraw();
   void CheckIfMoreTilesNeedToBePrepared();
 
   TileManagerClient* client_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   ResourcePool* resource_pool_;
   TileTaskRunner* tile_task_runner_;
@@ skipping 35 matching lines @@
 
   bool did_notify_ready_to_activate_;
   bool did_notify_ready_to_draw_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_