Move base to DEPS

base/profiler/scoped_tracker.h

-// Copyright 2014 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_SCOPED_TRACKER_H_
-#define BASE_PROFILER_SCOPED_TRACKER_H_
-
-//------------------------------------------------------------------------------
-// Utilities for temporarily instrumenting code to dig into issues that were
-// found using profiler data.
-
-#include "base/base_export.h"
-#include "base/bind.h"
-#include "base/callback_forward.h"
-#include "base/location.h"
-#include "base/profiler/scoped_profile.h"
-
-namespace tracked_objects {
-
-// ScopedTracker instruments a region within the code if the instrumentation is
-// enabled. It can be used, for example, to find out if a source of jankiness is
-// inside the instrumented code region.
-// Details:
-// 1. This class creates a task (like ones created by PostTask calls or IPC
-// message handlers). This task can be seen in chrome://profiler and is sent as
-// a part of profiler data to the UMA server. See profiler_event.proto.
-// 2. That task's lifetime is same as the lifetime of the ScopedTracker
-// instance.
-// 3. The execution time associated with the task is the wallclock time between
-// its constructor and destructor, minus wallclock times of directly nested
-// tasks.
-// 4. Task creation that this class utilizes is highly optimized.
-// 5. The class doesn't create a task unless this was enabled for the current
-// process. Search for ScopedTracker::Enable for the current list of processes
-// and channels where it's activated.
-// 6. The class is designed for temporarily instrumenting code to find
-// performance problems, after which the instrumentation must be removed.
-class BASE_EXPORT ScopedTracker {
- public:
-  ScopedTracker(const Location& location);
-
-  // Enables instrumentation for the remainder of the current process' life. If
-  // this function is not called, all profiler instrumentations are no-ops.
-  static void Enable();
-
-  // Augments a |callback| with provided |location|. This is useful for
-  // instrumenting cases when we know that a jank is in a callback and there are
-  // many possible callbacks, but they come from a relatively small number of
-  // places. We can instrument these few places and at least know which one
-  // passes the janky callback.
-  template <typename P1>
-  static base::Callback<void(P1)> TrackCallback(
-      const Location& location,
-      const base::Callback<void(P1)>& callback) {
-    return base::Bind(&ScopedTracker::ExecuteAndTrackCallback<P1>, location,
-                      callback);
-  }
-
- private:
-  // Executes |callback|, augmenting it with provided |location|.
-  template <typename P1>
-  static void ExecuteAndTrackCallback(const Location& location,
-                                      const base::Callback<void(P1)>& callback,
-                                      P1 p1) {
-    ScopedTracker tracking_profile(location);
-    callback.Run(p1);
-  }
-
-  const ScopedProfile scoped_profile_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedTracker);
-};
-
-}  // namespace tracked_objects
-
-#endif  // BASE_PROFILER_SCOPED_TRACKER_H_