Teach mojo_benchmark --save-traces to pull results from Android devices.

mojo/devtools/common/devtoolslib/android_shell.py

Index: mojo/devtools/common/devtoolslib/android_shell.py
diff --git a/mojo/devtools/common/devtoolslib/android_shell.py b/mojo/devtools/common/devtoolslib/android_shell.py
index a4a7d16db7261e650c0c776564dc35a6655e537b..4a12f819405c3a8eabefb110e1874be25a8807b4 100644
--- a/mojo/devtools/common/devtoolslib/android_shell.py
+++ b/mojo/devtools/common/devtoolslib/android_shell.py
@@ -199,6 +199,17 @@ class AndroidShell(Shell):
     return len(subprocess.check_output(self._adb_command([
         'shell', 'pm', 'list', 'packages', _MOJO_SHELL_PACKAGE_NAME]))) > 0
 
+  @staticmethod
+  def get_tmp_dir_path():

[etiennej, 2015/10/02 10:58:05]

Docstring please

[ppi, 2015/10/03 21:48:49]

Done.

+    return '/data/data/%s/cache/tmp/' % _MOJO_SHELL_PACKAGE_NAME
+
+  def pull_file(self, device_path, destination_path, remove_original=False):

[etiennej, 2015/10/02 10:58:04]

Docstring

[ppi, 2015/10/03 21:48:49]

Done.

+    subprocess.check_call(self._adb_command([
+        'pull', device_path, destination_path]))
+    if remove_original:
+      subprocess.check_call(self._adb_command([
+          'shell', 'rm', device_path]))
+
   def check_device(self, require_root=False):
     """Verifies if the device configuration allows adb to run.