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 8c3bb341594312dee8f977a450e9d4f02d904598..281226534446fa25f9007ea2b2ad07c630160c98 100644
--- a/cc/raster/tile_task_runner.h
+++ b/cc/raster/tile_task_runner.h
@@ -19,6 +19,9 @@ 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(
@@ -35,14 +38,6 @@ 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 +45,6 @@ class CC_EXPORT TileTask : public Task {
   TileTask();
   ~TileTask() override;
 
-  bool did_schedule_;
   bool did_complete_;
 };
 
@@ -78,13 +72,13 @@ 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.
@@ -94,8 +88,8 @@ 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;
@@ -103,6 +97,9 @@ 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);