Use file to pass arguments to the shell.

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 611732e045da426e1836253a76d3c78f038f30a8..79092f7c5ce8dd4c6cc9f51e869f0e3af292ab90 100644
--- a/mojo/devtools/common/devtoolslib/android_shell.py
+++ b/mojo/devtools/common/devtoolslib/android_shell.py
@@ -15,6 +15,7 @@ import sys
 import tempfile
 import threading
 import time
+import uuid
 
 from devtoolslib.http_server import start_http_server
 from devtoolslib.shell import Shell
@@ -349,8 +350,20 @@ class AndroidShell(Shell):
     parameters.extend(arguments)
 
     if parameters:
-      encodedParameters = json.dumps(parameters)
-      cmd += ['--es', 'encodedParameters', encodedParameters]
+      device_filename = (
+          '/sdcard/%s/%s' % (_MOJO_SHELL_PACKAGE_NAME, str(uuid.uuid4())))

[ppi, 2015/10/29 16:27:40]

Should we push this to some /cache/ folder so that these files can be easily
cleaned up if they leak?

[ppi, 2015/10/29 16:27:40]

can you append or prepend "mojo_shell_args" to the name in case anybody ever
looks at these files?

[qsr, 2015/10/29 16:57:02]

Not that I know of. Cache folder are in the app own directory, so they are not
accessible on non-rooted device.

[qsr, 2015/10/29 16:57:02]

It is already in a folder with the shell package name. So I just prepended args_

+      with tempfile.NamedTemporaryFile(delete=False) as temp:
+        try:
+          for parameter in parameters:
+            temp.write(parameter)
+            temp.write('\n')
+          temp.close()
+          subprocess.check_call(self._adb_command(
+              ['push', temp.name, device_filename]))
+        finally:
+          os.remove(temp.name)
+
+      cmd += ['--es', 'parametersFile', device_filename]

[ppi, 2015/10/29 16:27:40]

Should we call it argsFile for consistency?

[qsr, 2015/10/29 16:57:02]

Done.

 
     subprocess.check_call(cmd, stdout=self.verbose_pipe)