Update from https://crrev.com/333737

base/trace_event/process_memory_maps.cc

Index: base/trace_event/process_memory_maps.cc
diff --git a/base/trace_event/process_memory_maps.cc b/base/trace_event/process_memory_maps.cc
index d553ee88e8041d92c525dd77554179b889721c39..bb400de1743c851edb7435a123ef3e6c705841a1 100644
--- a/base/trace_event/process_memory_maps.cc
+++ b/base/trace_event/process_memory_maps.cc
@@ -16,6 +16,18 @@ const uint32 ProcessMemoryMaps::VMRegion::kProtectionFlagsRead = 4;
 const uint32 ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite = 2;
 const uint32 ProcessMemoryMaps::VMRegion::kProtectionFlagsExec = 1;
 
+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),
+      byte_stats_proportional_resident(0) {
+}
+
 ProcessMemoryMaps::ProcessMemoryMaps() {
 }
 
@@ -38,10 +50,15 @@ void ProcessMemoryMaps::AsValueInto(TracedValue* value) const {
     value->BeginDictionary("bs");  // byte stats
     value->SetString(
         "pss", StringPrintf(kHexFmt, region.byte_stats_proportional_resident));
-    value->SetString("prv",
-                     StringPrintf(kHexFmt, region.byte_stats_private_resident));
-    value->SetString("shr",
-                     StringPrintf(kHexFmt, region.byte_stats_shared_resident));
+    value->SetString(
+        "pd", StringPrintf(kHexFmt, region.byte_stats_private_dirty_resident));
+    value->SetString(
+        "pc", StringPrintf(kHexFmt, region.byte_stats_private_clean_resident));
+    value->SetString(
+        "sd", StringPrintf(kHexFmt, region.byte_stats_shared_dirty_resident));
+    value->SetString(
+        "sc", StringPrintf(kHexFmt, region.byte_stats_shared_clean_resident));
+    value->SetString("sw", StringPrintf(kHexFmt, region.byte_stats_swapped));
     value->EndDictionary();
 
     value->EndDictionary();
@@ -49,5 +66,9 @@ void ProcessMemoryMaps::AsValueInto(TracedValue* value) const {
   value->EndArray();
 }
 
+void ProcessMemoryMaps::Clear() {
+  vm_regions_.clear();
+}
+
 }  // namespace trace_event
 }  // namespace base