cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/raster/tile_task_runner.h

Index: cc/raster/tile_task_runner.h
diff --git a/cc/raster/tile_task_runner.h b/cc/raster/tile_task_runner.h
index fe0457506e3ab21db26c0f290d443e6d049d57c8..7622871a906ab10c7134d9a18fc3abac8e603e24 100644
--- a/cc/raster/tile_task_runner.h
+++ b/cc/raster/tile_task_runner.h
@@ -19,6 +19,13 @@ class RasterTask;
 class Resource;
 class RasterBuffer;
 
+enum TaskType : TaskTypeId {
+  TASK_TYPE_DEFAULT = kDefaultTaskTypeId,
+  TASK_TYPE_RASTER,
+  TASK_TYPE_IMAGE_DECODE,
+  TASK_TYPE_IMAGE_UPLOAD
+};
+
 class CC_EXPORT TileTaskClient {
  public:
   virtual std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
@@ -35,14 +42,6 @@ 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;
 
@@ -50,7 +49,6 @@ class CC_EXPORT TileTask : public Task {
   TileTask();
   ~TileTask() override;
 
-  bool did_schedule_;
   bool did_complete_;
 };
 
@@ -91,13 +89,13 @@ class CC_EXPORT RasterTask : public TileTask {
 };
 
 // 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.
@@ -107,8 +105,8 @@ class CC_EXPORT TileTaskRunner {
   // 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;
@@ -116,6 +114,9 @@ class CC_EXPORT TileTaskRunner {
   // 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);