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

components/tracing/process_metrics_memory_dump_provider.cc

Index: components/tracing/process_metrics_memory_dump_provider.cc
diff --git a/components/tracing/process_metrics_memory_dump_provider.cc b/components/tracing/process_metrics_memory_dump_provider.cc
index e73ea78711dc4818e86d3926899fd23bf82a3fc1..aab80eaed7fbbdbe663d81becf7aea162ae5efd9 100644
--- a/components/tracing/process_metrics_memory_dump_provider.cc
+++ b/components/tracing/process_metrics_memory_dump_provider.cc
@@ -60,15 +60,19 @@ bool ParseSmapsHeader(const char* header_line,
   region->protection_flags = 0;
   if (protection_flags[0] == 'r') {
     region->protection_flags |=
-        base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
+      base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
   }
   if (protection_flags[1] == 'w') {
     region->protection_flags |=
-        base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
+      base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
   }
   if (protection_flags[2] == 'x') {
     region->protection_flags |=
-        base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
+      base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
+  }
+  if (protection_flags[3] == 's') {
+    region->protection_flags |=
+      base::trace_event::ProcessMemoryMaps::VMRegion::kProtectionFlagsMayShare;
   }
 
   region->mapped_file = mapped_file;