Support impl-side painting in Mandoline.

components/view_manager/gles2/raster_thread_helper.cc

+// Copyright 2015 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 "components/view_manager/gles2/raster_thread_helper.h"
+
+#include "base/logging.h"
+#include "base/threading/simple_thread.h"
+#include "cc/raster/task_graph_runner.h"
+
+namespace gles2 {
+
+class RasterThreadHelper::RasterThread : public base::SimpleThread {
+ public:
+  RasterThread(cc::TaskGraphRunner* task_graph_runner)
+      : base::SimpleThread("CompositorTileWorker1"),
+        task_graph_runner_(task_graph_runner) {}
+
+  // Overridden from base::SimpleThread:
+  void Run() override { task_graph_runner_->Run(); }
+
+ private:
+  cc::TaskGraphRunner* task_graph_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(RasterThread);
+};
+
+RasterThreadHelper::RasterThreadHelper()
+    : task_graph_runner_(new cc::TaskGraphRunner),
+      raster_thread_(new RasterThread(task_graph_runner_.get())) {
+  raster_thread_->Start();
+}
+
+RasterThreadHelper::~RasterThreadHelper() {
+  task_graph_runner_->Shutdown();
+  raster_thread_->Join();
+}
+
+}  // namespace gles2