Add a field platform_private_footprint_ to ProcessMemoryTotals.

base/trace_event/process_memory_totals.cc

 // 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.
 
 #include "base/trace_event/process_memory_totals.h"
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 
 namespace base {
 namespace trace_event {
 
 ProcessMemoryTotals::ProcessMemoryTotals()
     : resident_set_bytes_(0),
       peak_resident_set_bytes_(0),
-      is_peak_rss_resetable_(false) {
-}
+      is_peak_rss_resetable_(false),
+      private_footprint_precursor_(0) {}
 
 ProcessMemoryTotals::~ProcessMemoryTotals() {}
 
 void ProcessMemoryTotals::AsValueInto(TracedValue* value) const {
   value->SetString("resident_set_bytes",
                    StringPrintf("%" PRIx64, resident_set_bytes_));
   if (peak_resident_set_bytes_ > 0) {
     value->SetString("peak_resident_set_bytes",
                      StringPrintf("%" PRIx64, peak_resident_set_bytes_));
     value->SetBoolean("is_peak_rss_resetable", is_peak_rss_resetable_);
   }
 
   for (const auto it : extra_fields_) {
     value->SetString(it.first, StringPrintf("%" PRIx64, it.second));
   }
 }
 
 void ProcessMemoryTotals::Clear() {
   resident_set_bytes_ = 0;
+  private_footprint_precursor_ = 0;
 }
 
 void ProcessMemoryTotals::SetExtraFieldInBytes(const char* name,
                                                uint64_t value) {
   DCHECK_EQ(0u, extra_fields_.count(name));
   extra_fields_[name] = value;
 }
 
 }  // namespace trace_event
 }  // namespace base