Support use of third party time function to profiler

base/profiler/tracked_time.h

 // Copyright (c) 2011 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 BASE_PROFILER_TRACKED_TIME_H_
 #define BASE_PROFILER_TRACKED_TIME_H_
 
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
@@ skipping 44 matching lines @@
 class BASE_EXPORT TrackedTime {  // Similar to base::TimeTicks.
  public:
   TrackedTime();
   explicit TrackedTime(const base::TimeTicks& time);
 
   static TrackedTime Now();
   Duration operator-(const TrackedTime& other) const;
   TrackedTime operator+(const Duration& other) const;
   bool is_null() const;
 
+  static TrackedTime FromMilliseconds(int32 ms) { return TrackedTime(ms); }
+
  private:
   friend class Duration;
   explicit TrackedTime(int32 ms);
 
   // Internal duration is stored directly in milliseconds.
   uint32 ms_;
 };
 
 #else
 
 // Just use full 64 bit time calculations, and the slower TimeTicks::Now().
 // This allows us (as an alternative) to test with larger ranges of times, and
 // with a more thoroughly tested class.
 
 typedef base::TimeTicks TrackedTime;
 typedef base::TimeDelta Duration;
 
 #endif  // USE_FAST_TIME_CLASS_FOR_DURATION_CALCULATIONS
 
 }  // namespace tracked_objects
 
 #endif  // BASE_PROFILER_TRACKED_TIME_H_