Factor DrainDataPipeJob out of MojoLoader

sky/engine/platform/fetcher/DrainDataPipeJob.h

+// 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.
+
+#ifndef SKY_ENGINE_PLATFORM_FETCHER_DRAIN_DATA_PIPE_JOB_H_
+#define SKY_ENGINE_PLATFORM_FETCHER_DRAIN_DATA_PIPE_JOB_H_
+
+#include "base/memory/weak_ptr.h"
+#include "mojo/common/handle_watcher.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace blink {
+
+class DrainDataPipeJob {

[eseidel, 2014/10/24 19:00:42]

DataPipeDrainer?

I have trouble with this name.

+ public:
+  class Client {
+   public:
+    virtual void OnDataAvailable(const void* data, size_t num_bytes) = 0;
+    virtual void OnDataComplete() = 0;
+
+   protected:
+    virtual ~Client() { }
+  };
+
+  DrainDataPipeJob(Client*, mojo::ScopedDataPipeConsumerHandle source);
+  ~DrainDataPipeJob();
+
+ private:
+  void ReadData();
+  void WaitForData();
+  void WaitComplete(MojoResult result);
+
+  Client* client_;
+  mojo::ScopedDataPipeConsumerHandle source_;
+  mojo::common::HandleWatcher handle_watcher_;
+
+  base::WeakPtrFactory<DrainDataPipeJob> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DrainDataPipeJob);
+};
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_PLATFORM_FETCHER_DRAIN_DATA_PIPE_JOB_H_