Insert logcat as part of test result for android instrumentation tests.

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 f8d37e76c0223bc5b3f001268120ccd5cbca42e7..afa04562b0cd694a37e49fc93924c3e83e80ea89 100644
--- a/build/android/pylib/instrumentation/instrumentation_test_instance.py
+++ b/build/android/pylib/instrumentation/instrumentation_test_instance.py
@@ -442,6 +442,9 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     self._store_tombstones = False
     self._initializeTombstonesAttributes(args)
 
+    self._should_save_logcat = None
+    self._initializeLogAttributes(args)
+
   def _initializeApkAttributes(self, args, error_func):
     if args.apk_under_test:
       apk_under_test_path = args.apk_under_test
@@ -594,6 +597,9 @@ class InstrumentationTestInstance(test_instance.TestInstance):
   def _initializeTombstonesAttributes(self, args):
     self._store_tombstones = args.store_tombstones
 
+  def _initializeLogAttributes(self, args):
+    self._should_save_logcat = bool(args.json_results_file)
+
   @property
   def additional_apks(self):
     return self._additional_apks
@@ -627,6 +633,10 @@ class InstrumentationTestInstance(test_instance.TestInstance):
     return self._flags
 
   @property
+  def should_save_logcat(self):
+    return self._should_save_logcat
+
+  @property
   def package_info(self):
     return self._package_info