cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/raster/task.cc

Index: cc/raster/task.cc
diff --git a/cc/raster/task.cc b/cc/raster/task.cc
index 4f26d12ba4495bef070161fd6b48569654755c51..dda6d96a11e26ecd678efb347f4e8e24c7194ed3 100644
--- a/cc/raster/task.cc
+++ b/cc/raster/task.cc
@@ -13,10 +13,8 @@ TaskState::TaskState() : value_(Value::NEW) {}
 TaskState::~TaskState() {
   DCHECK(value_ != Value::RUNNING)
       << "Running task should never get destroyed.";
-  DCHECK(value_ == Value::NEW || value_ == Value::FINISHED ||
-         value_ == Value::CANCELED)
-      << "Task, if scheduled, should get concluded either in FINISHED or "
-         "CANCELED state.";
+  DCHECK(value_ == Value::NEW || value_ == Value::COMPLETED)
+      << "Task, if scheduled, should get concluded in COMPLETED state.";
 }
 
 bool TaskState::IsScheduled() const {
@@ -26,13 +24,19 @@ bool TaskState::IsScheduled() const {
 bool TaskState::IsRunning() const {
   return value_ == Value::RUNNING;
 }
+
 bool TaskState::IsFinished() const {
   return value_ == Value::FINISHED;
 }
+
 bool TaskState::IsCanceled() const {
   return value_ == Value::CANCELED;
 }
 
+bool TaskState::IsCompleted() const {
+  return value_ == Value::COMPLETED;
+}
+
 void TaskState::Reset() {
   value_ = Value::NEW;
 }
@@ -62,6 +66,13 @@ void TaskState::DidCancel() {
   value_ = Value::CANCELED;
 }
 
+void TaskState::DidComplete() {
+  DCHECK(value_ == Value::FINISHED || value_ == Value::CANCELED)
+      << "Task should be finished or cancelled to get completed. Unscheduled "
+         "tasks cannot be completed.";
+  value_ = Value::COMPLETED;
+}
+
 Task::Task() {}
 
 Task::~Task() {}