DM: JSON output adds process_max_resident_set_size_MB

dm/DMJsonWriter.cpp

Index: dm/DMJsonWriter.cpp
diff --git a/dm/DMJsonWriter.cpp b/dm/DMJsonWriter.cpp
index e4a3d12d5bf84195527bc79e11fc2e27c442ae91..c017dde5b56c31c9e0ac3a377eecd504d372d9fe 100644
--- a/dm/DMJsonWriter.cpp
+++ b/dm/DMJsonWriter.cpp
@@ -7,6 +7,7 @@
 
 #include "DMJsonWriter.h"
 
+#include "ProcStats.h"
 #include "SkCommonFlags.h"
 #include "SkData.h"
 #include "SkJSONCPP.h"
@@ -74,6 +75,11 @@ void JsonWriter::DumpJson() {
         }
     }
 
+    int maxResidentSetSizeMB = sk_tools::getMaxResidentSetSizeMB();
+    if (maxResidentSetSizeMB != -1) {
+        root["max_rss_MB"] = sk_tools::getMaxResidentSetSizeMB();
+    }
+
     SkString path = SkOSPath::Join(FLAGS_writePath[0], "dm.json");
     sk_mkdir(FLAGS_writePath[0]);
     SkFILEWStream stream(path.c_str());