Update from https://crrev.com/307664

cc/resources/tile_task_runner.cc

+// 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.
+
+#include "cc/resources/tile_task_runner.h"
+
+#include <algorithm>
+
+namespace cc {
+
+TileTask::TileTask() : did_schedule_(false), did_complete_(false) {
+}
+
+TileTask::~TileTask() {
+  // Debugging CHECKs to help track down a use-after-free.
+  CHECK(!did_schedule_);
+  CHECK(!did_run_ || did_complete_);
+}
+
+ImageDecodeTask* TileTask::AsImageDecodeTask() {
+  return NULL;
+}
+
+RasterTask* TileTask::AsRasterTask() {
+  return NULL;
+}
+
+void TileTask::WillSchedule() {
+  DCHECK(!did_schedule_);
+}
+
+void TileTask::DidSchedule() {
+  did_schedule_ = true;
+  did_complete_ = false;
+}
+
+bool TileTask::HasBeenScheduled() const {
+  return did_schedule_;
+}
+
+void TileTask::WillComplete() {
+  DCHECK(!did_complete_);
+}
+
+void TileTask::DidComplete() {
+  DCHECK(did_schedule_);
+  DCHECK(!did_complete_);
+  did_schedule_ = false;
+  did_complete_ = true;
+}
+
+bool TileTask::HasCompleted() const {
+  return did_complete_;
+}
+
+ImageDecodeTask::ImageDecodeTask() {
+}
+
+ImageDecodeTask::~ImageDecodeTask() {
+}
+
+ImageDecodeTask* ImageDecodeTask::AsImageDecodeTask() {
+  return this;
+}
+
+RasterTask::RasterTask(const Resource* resource,
+                       ImageDecodeTask::Vector* dependencies)
+    : resource_(resource) {
+  dependencies_.swap(*dependencies);
+}
+
+RasterTask::~RasterTask() {
+}
+
+RasterTask* RasterTask::AsRasterTask() {
+  return this;
+}
+
+TileTaskQueue::Item::Item(RasterTask* task, const TaskSetCollection& task_sets)
+    : task(task), task_sets(task_sets) {
+  DCHECK(task_sets.any());
+}
+
+TileTaskQueue::Item::~Item() {
+}
+
+TileTaskQueue::TileTaskQueue() {
+}
+
+TileTaskQueue::~TileTaskQueue() {
+}
+
+void TileTaskQueue::Swap(TileTaskQueue* other) {
+  items.swap(other->items);
+}
+
+void TileTaskQueue::Reset() {
+  items.clear();
+}
+
+}  // namespace cc