Make Telemetry report VM peak metric on Android.

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index 1741619276ce56042a9a3df6f3b004fed1ebe3ad..d4ff05be4ed161ee9cc5c5725693a10e56ded5ad 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -1420,7 +1420,7 @@ class AndroidCommands(object):
       [0]: Dict of {metric:usage_kb}, for the process which has specified pid.
       The metric keys which may be included are: Size, Rss, Pss, Shared_Clean,
       Shared_Dirty, Private_Clean, Private_Dirty, Referenced, Swap,
-      KernelPageSize, MMUPageSize, Nvidia (tablet only).
+      KernelPageSize, MMUPageSize, Nvidia (tablet only), VmHWM.
       [1]: Detailed /proc/[PID]/smaps information.
     """
     usage_dict = collections.defaultdict(int)
@@ -1455,6 +1455,16 @@ class AndroidCommands(object):
         usage_dict['Nvidia'] = int(round(usage_bytes / 1000.0))  # kB
         break
 
+    peak_value_kb = 0
+    for line in self.GetProtectedFileContents('/proc/%s/status' % pid,
+                                              log_result=False):
+      if not line.startswith('VmHWM:'):  # Format: 'VmHWM: +[0-9]+ kB'
+        continue
+      peak_value_kb = int(line.split(':')[1].strip().split(' ')[0])
+    usage_dict['VmHWM'] = peak_value_kb
+    if not peak_value_kb:
+      logging.warning('Could not find memory peak value for pid ' + str(pid))
+
     return (usage_dict, smaps)
 
   def GetMemoryUsageForPackage(self, package):