android: Add thread time to early TraceEvent, make timings more precise.

base/trace_event/trace_log.h

 // Copyright 2015 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_TRACE_LOG_H_
 #define BASE_TRACE_EVENT_TRACE_LOG_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 251 matching lines @@
       const char** arg_names,
       const unsigned char* arg_types,
       const unsigned long long* arg_values,
       std::unique_ptr<ConvertableToTraceFormat>* convertable_values,
       unsigned int flags);
 
   void UpdateTraceEventDuration(const unsigned char* category_group_enabled,
                                 const char* name,
                                 TraceEventHandle handle);
 
+  void UpdateTraceEventDurationExplicit(
+      const unsigned char* category_group_enabled,
+      const char* name,
+      TraceEventHandle handle,
+      const TimeTicks& now,
+      const ThreadTicks& thread_now);
+
   void EndFilteredEvent(const unsigned char* category_group_enabled,
                         const char* name,
                         TraceEventHandle handle);
 
   int process_id() const { return process_id_; }
 
   uint64_t MangleEventId(uint64_t id);
 
   // Exposed for unittesting:
 
@@ skipping 212 matching lines @@
 
   FilterFactoryForTesting filter_factory_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_LOG_H_