Overhaul tracing_ui to use XHR and new tracing_controller

content/public/browser/tracing_controller.h

 // Copyright 2013 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_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 
+#include <set>
+
 #include "base/debug/trace_event.h"
 #include "content/common/content_export.h"
 
 namespace base {
 class FilePath;
 };
 
 namespace content {
 
 class TracingController;
 
 // TracingController is used on the browser processes to enable/disable
 // trace status and collect trace data. Only the browser UI thread is allowed
 // to interact with the TracingController object. All callbacks are called on
 // the UI thread.
 class TracingController {
  public:
   enum Options {
     ENABLE_SYSTRACE = 1 << 0,
     ENABLE_SAMPLING = 1 << 1,
+    RECORD_CONTINUOUSLY = 1 << 2,  // For EnableRecording() only.
   };
 
   CONTENT_EXPORT static TracingController* GetInstance();
 
   // Get a set of category groups. The category groups can change as
   // new code paths are reached.
   //
   // Once all child processes have acked to the GetCategories request,
   // GetCategoriesDoneCallback is called back with a set of category
   // groups.
@@ skipping 90 matching lines @@
   //
   // Trace data will be written into |result_file_path| if it is not empty, or
   // into a temporary file. The actual file path will be passed to |callback|.
   //
   // If |result_file_path| is empty and |callback| is null, trace data won't be
   // written to any file.
   virtual void CaptureMonitoringSnapshot(
       const base::FilePath& result_file_path,
       const TracingFileResultCallback& callback) = 0;
 
+  // Get the maximum across processes of trace buffer percent full state.
+  // When the TraceBufferPercentFull value is determined, the callback is
+  // called.
+  typedef base::Callback<void(float)> GetTraceBufferPercentFullCallback;
+  virtual bool GetTraceBufferPercentFull(
+      const GetTraceBufferPercentFullCallback& callback) = 0;
+
  protected:
   virtual ~TracingController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_