Added tombstones in instrumentation tests results.

build/android/pylib/instrumentation/instrumentation_test_instance.py

Index: build/android/pylib/instrumentation/instrumentation_test_instance.py
diff --git a/build/android/pylib/instrumentation/instrumentation_test_instance.py b/build/android/pylib/instrumentation/instrumentation_test_instance.py
index 62e62b8034a77649bb69cf741d092d57960f916f..3b73224fbdb4ec0311b3dd9b2cb172ae9a1e13f6 100644
--- a/build/android/pylib/instrumentation/instrumentation_test_instance.py
+++ b/build/android/pylib/instrumentation/instrumentation_test_instance.py
@@ -393,6 +393,9 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     self._coverage_directory = None
     self._initializeTestCoverageAttributes(args)
 
+    self._store_tombstones = False
+    self._initializeStoreTombstonesAttributes(args)
+
   def _initializeApkAttributes(self, args, error_func):
     if args.apk_under_test:
       apk_under_test_path = args.apk_under_test
@@ -535,6 +538,9 @@ class InstrumentationTestInstance(test_instance.TestInstance):
   def _initializeTestCoverageAttributes(self, args):
     self._coverage_directory = args.coverage_dir
 
+  def _initializeStoreTombstonesAttributes(self, args):

[mikecase (-- gone --), 2016/08/02 17:27:29]

nit: this should be named _initializeTombstonesAttributes or like something more
general even like _initializeLoggingAttributes or something?

[BigBossZhiling, 2016/08/02 21:01:56]

Done.

+    self._store_tombstones = args.store_tombstones
+
   @property
   def additional_apks(self):
     return self._additional_apks
@@ -576,6 +582,10 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     return self._screenshot_dir
 
   @property
+  def store_tombstones(self):
+    return self._store_tombstones
+
+  @property
   def suite(self):
     return self._suite