[tracing] Implement polling in MemoryDumpManager

base/trace_event/heap_profiler_heap_dump_writer.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/heap_profiler_heap_dump_writer.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 296 matching lines @@
 }
 
 }  // namespace internal
 
 std::unique_ptr<TracedValue> ExportHeapDump(
     const hash_map<AllocationContext, AllocationMetrics>& metrics_by_context,
     const MemoryDumpSessionState& session_state) {
   internal::HeapDumpWriter writer(
       session_state.stack_frame_deduplicator(),
       session_state.type_name_deduplicator(),
-      session_state.memory_dump_config().heap_profiler_options
-          .breakdown_threshold_bytes);
+      session_state.heap_profiler_breakdown_threshold_bytes());
   return Serialize(writer.Summarize(metrics_by_context));
 }
 
 }  // namespace trace_event
 }  // namespace base