[tracing] Support shared and private permission. (missing perm flag)

base/trace_event/process_memory_maps.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_maps.h"
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 
 namespace base {
 namespace trace_event {
 
 // static
 const uint32_t ProcessMemoryMaps::VMRegion::kProtectionFlagsRead = 4;
 const uint32_t ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite = 2;
 const uint32_t ProcessMemoryMaps::VMRegion::kProtectionFlagsExec = 1;
+const uint32_t ProcessMemoryMaps::VMRegion::kProtectionFlagsMayshare = 128;
 
 ProcessMemoryMaps::VMRegion::VMRegion()
     : start_address(0),
       size_in_bytes(0),
       protection_flags(0),
       byte_stats_private_dirty_resident(0),
       byte_stats_private_clean_resident(0),
       byte_stats_shared_dirty_resident(0),
       byte_stats_shared_clean_resident(0),
       byte_stats_swapped(0),
@@ skipping 37 matching lines @@
   }
   value->EndArray();
 }
 
 void ProcessMemoryMaps::Clear() {
   vm_regions_.clear();
 }
 
 }  // namespace trace_event
 }  // namespace base