Add ownership edges between HostSharedBitmap and shared memory

base/trace_event/process_memory_dump.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_DUMP_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 
 #include <stddef.h>
 
 #include <unordered_map>
@@ skipping 35 matching lines @@
   };
 
   // Maps allocator dumps absolute names (allocator_name/heap/subheap) to
   // MemoryAllocatorDump instances.
   using AllocatorDumpsMap =
       std::unordered_map<std::string, std::unique_ptr<MemoryAllocatorDump>>;
 
   using HeapDumpsMap =
       std::unordered_map<std::string, std::unique_ptr<TracedValue>>;
 
+  static const int kDefaultImportance = 0;
+
 #if defined(COUNT_RESIDENT_BYTES_SUPPORTED)
   // Returns the number of bytes in a kernel memory page. Some platforms may
   // have a different value for kernel page sizes from user page sizes. It is
   // important to use kernel memory page sizes for resident bytes calculation.
   // In most cases, the two are the same.
   static size_t GetSystemPageSize();
 
   // Returns the total bytes resident for a virtual address range, with given
   // |start_address| and |mapped_size|. |mapped_size| is specified in bytes. The
   // value returned is valid only if the given range is currently mmapped by the
@@ skipping 147 matching lines @@
   // background mode are disabled for testing.
   static bool is_black_hole_non_fatal_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMemoryDump);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_