Revert of Revert "Revert 237280 "Remove TraceController""

content/browser/tracing/trace_subscriber_stdio.h

Index: content/browser/tracing/trace_subscriber_stdio.h
diff --git a/content/browser/tracing/trace_subscriber_stdio.h b/content/browser/tracing/trace_subscriber_stdio.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9fc4f74c199594d525c519671e55920205a1ccf
--- /dev/null
+++ b/content/browser/tracing/trace_subscriber_stdio.h
@@ -0,0 +1,57 @@
+// Copyright (c) 2012 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_TRACING_TRACE_SUBSCRIBER_STDIO_H_
+#define CONTENT_BROWSER_TRACING_TRACE_SUBSCRIBER_STDIO_H_
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "content/public/browser/trace_subscriber.h"
+#include "content/common/content_export.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace content {
+
+// Stdio implementation of TraceSubscriber. Use this to write traces to a file.
+class CONTENT_EXPORT TraceSubscriberStdio
+    : NON_EXPORTED_BASE(public TraceSubscriber) {
+ public:
+  enum FileType {
+    // Output file as array, representing trace events:
+    // [event1, event2, ...]
+    FILE_TYPE_ARRAY,
+    // Output file as property list with one or two items:
+    // {traceEvents: [event1, event2, ...],
+    //  systemTraceEvents: "event1\nevent2\n..." // optional}
+    FILE_TYPE_PROPERTY_LIST
+  };
+
+  // has_system_trace indicates whether system trace events are expected.
+  TraceSubscriberStdio(const base::FilePath& path,
+                       FileType file_type,
+                       bool has_system_trace);
+  virtual ~TraceSubscriberStdio();
+
+  // Implementation of TraceSubscriber
+  virtual void OnEndTracingComplete() OVERRIDE;
+  virtual void OnTraceDataCollected(
+      const scoped_refptr<base::RefCountedString>& data_ptr) OVERRIDE;
+
+  // To be used as callback to DebugDaemonClient::RequestStopSystemTracing().
+  virtual void OnEndSystemTracing(
+      const scoped_refptr<base::RefCountedString>& events_str_ptr);
+
+ private:
+  class TraceSubscriberStdioWorker;
+  scoped_refptr<TraceSubscriberStdioWorker> worker_;
+  DISALLOW_COPY_AND_ASSIGN(TraceSubscriberStdio);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_TRACING_TRACE_SUBSCRIBER_STDIO_H_