memory-infra: Plumb platform_private_footprint to MemoryDumpManager

base/trace_event/process_memory_totals.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_PROCESS_MEMORY_TOTALS_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_TOTALS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 34 matching lines @@
     // Linux, Android, ChromeOS
     // TODO(hjd): https://crbug.com/707019
     uint64_t rss_anon_bytes = 0;
     uint64_t vm_swap_bytes = 0;
 
     // On Windows,
     //   TBD: https://crbug.com/707022
     // On iOS,
     //   TBD: https://crbug.com/714961
   };
+  const PlatformPrivateFootprint& GetPlatformPrivateFootprint() const {
+    return platform_private_footprint_;
+  }
   PlatformPrivateFootprint& GetPlatformPrivateFootprint() {
     return platform_private_footprint_;
   }
 
   uint64_t peak_resident_set_bytes() const { return peak_resident_set_bytes_; }
   void set_peak_resident_set_bytes(uint64_t value) {
     peak_resident_set_bytes_ = value;
   }
 
   // On some platforms (recent linux kernels, see goo.gl/sMvAVz) the peak rss
@@ skipping 17 matching lines @@
   // Extra metrics for OS-specific statistics.
   std::map<const char*, uint64_t> extra_fields_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMemoryTotals);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_TOTALS_H_