Add ability to pass through parameter from adb_run_mojo_shell

I would have liked the ability to pass through an array but I couldn't
see to get that to work.

BUG=none
TEST=none
R=qsr@chromium.org

Review URL: https://codereview.chromium.org/782823003

Cr-Original-Commit-Position: refs/heads/master@{#307546}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 70aa001db4905b2c1ec92043c1572fd1287593f9

android/adb_run_mojo_shell

@@ -5,10 +5,12 @@
 # found in the LICENSE file.
 
 optional_url=$1
+parameters=$2
 
 adb logcat -c
 adb shell am start -S \
   -a android.intent.action.VIEW \
   -n org.chromium.mojo_shell_apk/.MojoShellActivity \
+  ${parameters:+--esa parameters "$parameters"} \
   ${optional_url:+-d "$optional_url"}
 adb logcat -s MojoShellApplication MojoShellActivity chromium