memory-infra: Switch to MemoryPeakDetector and simplify MemoryDumpScheduler

base/trace_event/memory_peak_detector.h

 // Copyright 2017 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_TRACE_EVENT_MEMORY_PEAK_DETECTOR_H_
 #define BASE_TRACE_EVENT_MEMORY_PEAK_DETECTOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 29 matching lines @@
   using GetDumpProvidersFunction = RepeatingCallback<void(DumpProvidersList*)>;
 
   enum State {
     NOT_INITIALIZED = 0,  // Before Setup()
     DISABLED,             // Before Start() or after Stop().
     ENABLED,              // After Start() but no dump_providers_ are available.
     RUNNING  // After Start(). The PollMemoryAndDetectPeak() task is scheduled.
   };
 
   // Peak detector configuration, passed to Start().
-  struct Config {
+  struct BASE_EXPORT Config {
+    Config();
+    Config(uint32_t polling_interval_ms,
+           uint32_t min_time_between_peaks_ms,
+           bool enable_verbose_poll_tracing);
+
     // The rate at which memory will be polled. Polls will happen on the task
     // runner passed to Setup().
     uint32_t polling_interval_ms;
 
     // Two consecutive peak detection callbacks will happen at least
     // |min_time_between_peaks_ms| apart from each other.
     uint32_t min_time_between_peaks_ms;
 
     // When enabled causes a TRACE_COUNTER event to be injected in the trace
     // for each poll (if tracing is enabled).
@@ skipping 109 matching lines @@
   uint32_t samples_index_;
   uint32_t poll_tasks_count_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryPeakDetector);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_PEAK_DETECTOR_H_