DevTools: provide an option to return traces as streams

content/browser/devtools/protocol/io_handler.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_BROWSER_DEVTOOLS_PROTOCOL_IO_HANDLER_H_
+#define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_IO_HANDLER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "content/browser/devtools/protocol/devtools_protocol_dispatcher.h"
+
+namespace base {
+class RefCountedString;
+}
+
+namespace content {
+namespace devtools {
+class DevToolsIOContext;
+
+namespace io {
+
+class Client;
+
+class IOHandler {
+ public:
+  using Response = DevToolsProtocolClient::Response;
+
+  explicit IOHandler(DevToolsIOContext* io_context);
+  ~IOHandler();
+
+  void SetClient(const scoped_ptr<Client>& client);
+
+  // Protocol methods.
+  Response Read(DevToolsCommandId command_id, const std::string& handle,
+      const int* offset, const int* max_size);
+  Response Close(const std::string& handle);
+
+ private:
+  void ReadComplete(DevToolsCommandId command_id,
+      const scoped_refptr<base::RefCountedString>& data, int status);
+
+  DevToolsIOContext* io_context_;
+  base::WeakPtrFactory<IOHandler> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(IOHandler);
+};
+
+}  // namespace io
+}  // namespace devtools
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_