(Reland) Add failure screenshots and images to results detail.

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 5261ff284b3c76c78404200be2a3bfff35074f25..787b4e082b10f8b67373674714e2e30563fa9ffe 100644
--- a/build/android/pylib/instrumentation/instrumentation_test_instance.py
+++ b/build/android/pylib/instrumentation/instrumentation_test_instance.py
@@ -498,6 +498,7 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     self._store_tombstones = False
     self._initializeTombstonesAttributes(args)
 
+    self._should_save_images = None
     self._should_save_logcat = None
     self._initializeLogAttributes(args)
 
@@ -683,6 +684,7 @@ class InstrumentationTestInstance(test_instance.TestInstance):
 
   def _initializeLogAttributes(self, args):
     self._should_save_logcat = bool(args.json_results_file)
+    self._should_save_images = bool(args.json_results_file)

[jbudorick, 2017/04/11 00:36:43]

nit: alpha

[mikecase (-- gone --), 2017/04/26 18:01:51]

done

 
   def _initializeEditPrefsAttributes(self, args):
     if not hasattr(args, 'shared_prefs_file'):
@@ -747,6 +749,10 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     return self._flags
 
   @property
+  def should_save_images(self):
+    return self._should_save_images
+
+  @property
   def should_save_logcat(self):
     return self._should_save_logcat