DM: expand peak RAM usage to Mac and Android too.

dm/DMReporter.cpp

Index: dm/DMReporter.cpp
diff --git a/dm/DMReporter.cpp b/dm/DMReporter.cpp
index 5187a6f453ae6ab086793756d58e42436d83558a..14f50871021ea42e811e547fc452b48089c2f300 100644
--- a/dm/DMReporter.cpp
+++ b/dm/DMReporter.cpp
@@ -4,12 +4,16 @@
 #include "SkCommonFlags.h"
 #include "OverwriteLine.h"
 
-#ifdef SK_BUILD_FOR_UNIX
+#if defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_ANDROID)
     #include <sys/resource.h>
     static long get_max_rss_kb() {
         struct rusage ru;
         getrusage(RUSAGE_SELF, &ru);
-        return ru.ru_maxrss;
+    #if defined(SK_BUILD_FOR_MAC)
+        return ru.ru_maxrss / 1024;  // Darwin reports bytes.
+    #else
+        return ru.ru_maxrss;         // Linux reports kilobytes.
+    #endif
     }
 #else
     static long get_max_rss_kb() { return 0; }