Adds --skip-clear-data flag to android's test_runner.py

build/android/pylib/local/device/local_device_gtest_run.py

Index: build/android/pylib/local/device/local_device_gtest_run.py
diff --git a/build/android/pylib/local/device/local_device_gtest_run.py b/build/android/pylib/local/device/local_device_gtest_run.py
index ce73c43b8ee0f620a4c9f91bcf9d4416d47b2790..74335239fa56165204d3ef44fa6ceddc6b69300e 100644
--- a/build/android/pylib/local/device/local_device_gtest_run.py
+++ b/build/android/pylib/local/device/local_device_gtest_run.py
@@ -344,9 +344,7 @@ class LocalDeviceGtestRun(local_device_test_run.LocalDeviceTestRun):
     if self._test_instance.app_files:
       self._delegate.PullAppFiles(device, self._test_instance.app_files,
                                   self._test_instance.app_file_dir)
-    # Clearing data when using incremental install wipes out cached optimized
-    # dex files (and shouldn't be necessary by tests anyways).
-    if not self._env.incremental_install:
+    if not self._test_instance.skip_clear_data:

[jbudorick, 2016/02/03 14:38:27]

Why are we adding this in addition to --incremental-install?

[agrieve, 2016/02/03 16:34:32]

I'm envisioning adding a --fast-local-dev (or better name appreciated), which
will turn on all of these iffy flags, and which will be used by the _incremental
generated script, but also useful for non-incremental local builds.

       self._delegate.Clear(device)
 
     # Parse the output.