Revert "Revert 237280 "Remove TraceController""

content/browser/devtools/devtools_tracing_handler.h

 // 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_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 
-#include "base/debug/trace_event.h"
+#include "base/memory/weak_ptr.h"
 #include "content/browser/devtools/devtools_protocol.h"
-#include "content/public/browser/trace_subscriber.h"
+#include "content/public/browser/tracing_controller.h"
+
+namespace base {
+class RefCountedString;
+}
 
 namespace content {
 
 // This class bridges DevTools remote debugging server with the trace
 // infrastructure.
-class DevToolsTracingHandler
-    : public TraceSubscriber,
-      public DevToolsProtocol::Handler {
+class DevToolsTracingHandler : public DevToolsProtocol::Handler {
  public:
   DevToolsTracingHandler();
   virtual ~DevToolsTracingHandler();
 
-  // TraceSubscriber:
-  virtual void OnEndTracingComplete() OVERRIDE;;
-  virtual void OnTraceDataCollected(
-      const scoped_refptr<base::RefCountedString>& trace_fragment) OVERRIDE;
+ private:
+  void BeginReadingRecordingResult(const base::FilePath& path);
+  void ReadRecordingResult(const scoped_refptr<base::RefCountedString>& result);
+  void OnTraceDataCollected(const std::string& trace_fragment);
 
- private:
   scoped_refptr<DevToolsProtocol::Response> OnStart(
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> OnEnd(
       scoped_refptr<DevToolsProtocol::Command> command);
 
-  base::debug::TraceLog::Options TraceOptionsFromString(
-      const std::string& options);
+  TracingController::Options TraceOptionsFromString(const std::string& options);
 
-  bool is_running_;
+  base::WeakPtrFactory<DevToolsTracingHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsTracingHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_