[DO NOT REVIEW][DO NOT COMMIT] Implement WebDataProducerHandleImpl.

content/child/web_data_producer_handle_impl.h

+// 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.
+
+#ifndef CONTENT_CHILD_WEB_DATA_PRODUCER_HANDLE_IMPL_H_
+#define CONTENT_CHILD_WEB_DATA_PRODUCER_HANDLE_IMPL_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "mojo/common/handle_watcher.h"
+#include "mojo/public/cpp/system/data_pipe.h"
+#include "third_party/WebKit/public/platform/WebDataProducerHandle.h"
+
+namespace content {
+
+class CONTENT_EXPORT WebDataProducerHandleImpl final
+    : public NON_EXPORTED_BASE(blink::WebDataProducerHandle) {
+  typedef mojo::ScopedDataPipeProducerHandle Handle;
+ public:
+  explicit WebDataProducerHandleImpl(Handle handle);
+  virtual ~WebDataProducerHandleImpl();
+
+  virtual Result write(const void* data, size_t size, Flags flags,
+                       size_t* writtenSize);
+  virtual Result beginWrite(void** buffer, Flags flags, size_t* available);
+  virtual Result endWrite(size_t writtenSize);
+  virtual void registerClient(Client* client);
+  virtual void unregisterClient();
+
+ private:
+  Result HandleWriteResult(MojoResult);
+  void OnHandleGotWritable(MojoResult);
+
+  Handle handle_;
+  Client* client_;
+  mojo::common::HandleWatcher handle_watcher_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_WEB_DATA_PRODUCER_HANDLE_IMPL_H_