cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/raster/tile_task_runner.h

 // Copyright 2014 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_RASTER_TILE_TASK_RUNNER_H_
 #define CC_RASTER_TILE_TASK_RUNNER_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/callback.h"
 #include "cc/raster/task_graph_runner.h"
 #include "cc/resources/resource_format.h"
 
 namespace cc {
 class ImageDecodeTask;
 class RasterTask;
 class Resource;
 class RasterBuffer;
 
+const TaskTypeId kRasterTaskTypeId = kDefaultTaskTypeId + 1;
+const TaskTypeId kImageDecodeTaskTypeId = kDefaultTaskTypeId + 2;
+
 class CC_EXPORT TileTaskClient {
  public:
   virtual std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource,
       uint64_t resource_content_id,
       uint64_t previous_content_id) = 0;
   virtual void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) = 0;
 
  protected:
   virtual ~TileTaskClient() {}
 };
 
 class CC_EXPORT TileTask : public Task {
  public:
   typedef std::vector<scoped_refptr<TileTask>> Vector;
 
-  virtual void ScheduleOnOriginThread(TileTaskClient* client) = 0;
-  virtual void CompleteOnOriginThread(TileTaskClient* client) = 0;
-
-  void WillSchedule();
-  void DidSchedule();
-  bool HasBeenScheduled() const;
-
-  void WillComplete();
   void DidComplete();
   bool HasCompleted() const;
 
  protected:
   TileTask();
   ~TileTask() override;
 
-  bool did_schedule_;
   bool did_complete_;
 };
 
 class CC_EXPORT ImageDecodeTask : public TileTask {
  public:
   typedef std::vector<scoped_refptr<ImageDecodeTask>> Vector;
 
  protected:
   ImageDecodeTask();
   ~ImageDecodeTask() override;
 };
 
 class CC_EXPORT RasterTask : public TileTask {
  public:
   typedef std::vector<scoped_refptr<RasterTask>> Vector;
 
   const ImageDecodeTask::Vector& dependencies() const { return dependencies_; }
 
  protected:
   explicit RasterTask(ImageDecodeTask::Vector* dependencies);
   ~RasterTask() override;
 
  private:
   ImageDecodeTask::Vector dependencies_;
 };
 
 // This interface can be used to schedule and run tile tasks.
-// The client can call CheckForCompletedTasks() at any time to dispatch
-// pending completion callbacks for all tasks that have finished running.
+// The client can call CollectCompletedTasks() at any time to process
+// all completed tasks at the moment that have finished running or cancelled.
 class CC_EXPORT TileTaskRunner {
  public:
   // Tells the worker pool to shutdown after canceling all previously scheduled
   // tasks. Reply callbacks are still guaranteed to run when
-  // CheckForCompletedTasks() is called.
+  // CollectCompletedTasks() is called.
   virtual void Shutdown() = 0;
 
   // Schedule running of tile tasks in |graph| and all dependencies.
   // Previously scheduled tasks that are not in |graph| will be canceled unless
   // already running. Once scheduled, reply callbacks are guaranteed to run for
   // all tasks even if they later get canceled by another call to
   // ScheduleTasks().
   virtual void ScheduleTasks(TaskGraph* graph) = 0;
 
-  // Check for completed tasks and dispatch reply callbacks.
-  virtual void CheckForCompletedTasks() = 0;
+  // Collect completed tasks.
+  virtual void CollectCompletedTasks(Task::Vector* completed_tasks) = 0;
 
   // Returns the format to use for the tiles.
   virtual ResourceFormat GetResourceFormat(bool must_support_alpha) const = 0;
 
   // Determine if the resource requires swizzling.
   virtual bool GetResourceRequiresSwizzle(bool must_support_alpha) const = 0;
 
+  // TODO(prashant.n): This will be removed soon. Don't use this.
+  virtual TileTaskClient* AsTileTaskClient() = 0;
+
  protected:
   // Check if resource format matches output format.
   static bool ResourceFormatRequiresSwizzle(ResourceFormat format);
 
   virtual ~TileTaskRunner() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_TILE_TASK_RUNNER_H_