Implement WebDataConsumerHandle.

content/child/web_data_consumer_handle_impl.h

Index: content/child/web_data_consumer_handle_impl.h
diff --git a/content/child/web_data_consumer_handle_impl.h b/content/child/web_data_consumer_handle_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..c83d48790a95cc7a56913180308df94b542390a5
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+++ b/content/child/web_data_consumer_handle_impl.h
@@ -0,0 +1,38 @@
+// 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 CONTENT_CHILD_WEB_DATA_CONSUMER_HANDLE_IMPL_H_
+#define CONTENT_CHILD_WEB_DATA_CONSUMER_HANDLE_IMPL_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "mojo/common/handle_watcher.h"
+#include "mojo/public/cpp/system/data_pipe.h"
+#include "third_party/WebKit/public/platform/WebDataConsumerHandle.h"
+
+namespace content {
+
+class WebDataConsumerHandleImpl final : public blink::WebDataConsumerHandle {
+  typedef mojo::ScopedDataPipeConsumerHandle Handle;
+ public:
+  explicit WebDataConsumerHandleImpl(Handle handle);
+  virtual ~WebDataConsumerHandleImpl();
+
+  virtual Result read(void* data, size_t size, Flags flags, size_t* readSize);
+  virtual Result beginRead(const void** buffer, Flags flags, size_t* available);
+  virtual Result endRead(size_t readSize);
+  virtual void registerClient(Client* client);
+  virtual void unregisterClient();
+
+ private:
+  Result HandleReadResult(MojoResult);
+  void OnHandleGotReadable(MojoResult);
+
+  Handle handle_;
+  Client* client_;
+  mojo::common::HandleWatcher handle_watcher_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_WEB_DATA_CONSUMER_HANDLE_IMPL_H_