Make stack sampling profiler sample beyond startup.

components/metrics/call_stack_profile_collector.cc

 // Copyright 2016 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 "components/metrics/call_stack_profile_collector.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/metrics/call_stack_profile_metrics_provider.h"
@@ skipping 18 matching lines @@
       std::move(request));
 }
 
 void CallStackProfileCollector::Collect(
     const CallStackProfileParams& params,
     base::TimeTicks start_timestamp,
     std::vector<CallStackProfile> profiles) {
   if (params.process != expected_process_)
     return;
 
+  CallStackProfileParams params_copy = params;
+  params_copy.start_timestamp = start_timestamp;
   CallStackProfileMetricsProvider::ReceiveCompletedProfiles(
-      params, start_timestamp, std::move(profiles));
+      &params_copy, std::move(profiles));
 }
 
 }  // namespace metrics