profiler: cleanup unused alternate_timer code

base/tracked_objects.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 BASE_TRACKED_OBJECTS_H_
 #define BASE_TRACKED_OBJECTS_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
 #include <stack>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/containers/hash_tables.h"
 #include "base/gtest_prod_util.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/process/process_handle.h"
-#include "base/profiler/alternate_timer.h"
 #include "base/profiler/tracked_time.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "base/threading/thread_local_storage.h"
 
 namespace base {
 struct TrackingInfo;
 }
 
 // TrackedObjects provides a database of stats about objects (generally Tasks)
@@ skipping 494 matching lines @@
 
   // Enables profiler timing.
   static void EnableProfilerTiming();
 
   // Provide a time function that does nothing (runs fast) when we don't have
   // the profiler enabled.  It will generally be optimized away when it is
   // ifdef'ed to be small enough (allowing the profiler to be "compiled out" of
   // the code).
   static TrackedTime Now();
 
-  // Use the function |now| to provide current times, instead of calling the
-  // TrackedTime::Now() function.  Since this alternate function is being used,
-  // the other time arguments (used for calculating queueing delay) will be
-  // ignored.
-  static void SetAlternateTimeSource(NowFunction* now);
-
   // This function can be called at process termination to validate that thread
   // cleanup routines have been called for at least some number of named
   // threads.
   static void EnsureCleanupWasCalled(int major_threads_shutdown_count);
 
  private:
   friend class TaskStopwatch;
   // Allow only tests to call ShutdownSingleThreadedCleanup.  We NEVER call it
   // in production code.
   // TODO(jar): Make this a friend in DEBUG only, so that the optimizer has a
   // better change of optimizing (inlining? etc.) private methods (knowing that
   // there will be no need for an external entry point).
   friend class TrackedObjectsTest;
   FRIEND_TEST_ALL_PREFIXES(TrackedObjectsTest, MinimalStartupShutdown);
   FRIEND_TEST_ALL_PREFIXES(TrackedObjectsTest, TinyStartupShutdown);
 
+  // Type for an alternate timer function (testing only).
+  typedef unsigned int NowFunction();
+
   typedef std::map<const BirthOnThread*, int> BirthCountMap;
-
   typedef std::vector<std::pair<const Births*, DeathDataPhaseSnapshot>>
       DeathsSnapshot;
 
   // Worker thread construction creates a name since there is none.
   explicit ThreadData(int thread_number);
 
   // Message loop based construction should provide a name.
   explicit ThreadData(const std::string& suggested_name);
 
   ~ThreadData();
@@ skipping 54 matching lines @@
   // true, and the data structures (birth maps, death maps, ThreadData
   // insntances, etc.) will be leaked and not deleted.  If you have joined all
   // threads since the time that InitializeAndSetTrackingStatus() was called,
   // then you can pass in a |leak| value of false, and this function will
   // delete recursively all data structures, starting with the list of
   // ThreadData instances.
   static void ShutdownSingleThreadedCleanup(bool leak);
 
   // When non-null, this specifies an external function that supplies monotone
   // increasing time functcion.
-  static NowFunction* now_function_;
-
-  // If true, now_function_ returns values that can be used to calculate queue
-  // time.
-  static bool now_function_is_time_;
+  static NowFunction* now_function_for_testing_;
 
   // We use thread local store to identify which ThreadData to interact with.
   static base::ThreadLocalStorage::StaticSlot tls_index_;
 
   // List of ThreadData instances for use with worker threads.  When a worker
   // thread is done (terminated), we push it onto this list.  When a new worker
   // thread is created, we first try to re-use a ThreadData instance from the
   // list, and if none are available, construct a new one.
   // This is only accessed while list_lock_ is held.
   static ThreadData* first_retired_worker_;
@@ skipping 165 matching lines @@
   ProcessDataSnapshot();
   ~ProcessDataSnapshot();
 
   PhasedProcessDataSnapshotMap phased_snapshots;
   base::ProcessId process_id;
 };
 
 }  // namespace tracked_objects
 
 #endif  // BASE_TRACKED_OBJECTS_H_