Refactor adb_*_command_line helpers bash->python

build/android/adb_command_line_functions.sh

-#!/bin/bash
-#
-# Copyright 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Variables must be set before calling:
-# CMD_LINE_FILE - Path on device to flags file.
-# REQUIRES_SU - Set to 1 if path requires root.
-function set_command_line() {
-  SU_CMD=""
-  if [[ "$REQUIRES_SU" = 1 ]]; then
-    # Older androids accept "su -c", while newer use "su uid".
-    SDK_LEVEL=$(adb shell getprop ro.build.version.sdk | tr -d '\r')
-    # E.g. if no device connected.
-    if [[ -z "$SDK_LEVEL" ]]; then
-      exit 1
-    fi
-    SU_CMD="su -c"
-    if (( $SDK_LEVEL >= 21 )); then
-      SU_CMD="su 0"
-    fi
-  fi
-
-  if [ $# -eq 0 ] ; then
-    # If nothing specified, print the command line (stripping off "chrome ")
-    adb shell "cat $CMD_LINE_FILE 2>/dev/null" | cut -d ' ' -s -f2-
-  elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-    # If given an empty string, delete the command line.
-    set -x
-    adb shell $SU_CMD rm $CMD_LINE_FILE >/dev/null
-  else
-    # Else set it.
-    set -x
-    adb shell "echo 'chrome $*' | $SU_CMD dd of=$CMD_LINE_FILE"
-    # Prevent other apps from modifying flags (this can create security issues).
-    adb shell $SU_CMD chmod 0664 $CMD_LINE_FILE
-  fi
-}
-