Replaced apk_command_line with adb_cast_shell_command_line.

The new script uses the adb_command_line.py script in build/android
and is therefore compatible with the --device argument.

BUG= internal b/26406816

Review URL: https://codereview.chromium.org/1750393003

Cr-Original-Commit-Position: refs/heads/master@{#378780}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 24d7960decb02198c73a9fcd3e847de8e97702fe

android/adb_cast_shell_command_line

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+# Copyright 2016 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.
+
+# If no flags are given, prints the current cast shell flags.
+#
+# Otherwise, the given flags are used to REPLACE (not modify) the cast shell
+# flags. For example:
+#   apk_command_line --enable-media-thread-for-media-playback
+#
+# If multiple devices are connected, use the --device argument to specify the
+# device ID. You can use
+#   adb devices
+# ... to find the device's ID.
+#
+# To remove all content shell flags, pass an empty string for the flags:
+#   apk_command_line ""
+
+exec $(dirname $0)/../../build/android/adb_command_line.py -e cast_shell \
+  --device-path /data/local/tmp/castshell-command-line "$@"

android/adb_command_line.py

@@ -28,6 +28,8 @@ Otherwise: Writes command-line file.
                       help='Target device for apk to install on.')
   parser.add_argument('--device-path', required=True,
                       help='Remote path to flags file.')
+  parser.add_argument('-e', '--executable', dest='executable', default='chrome',
+                      help='Name of the executable.')
   args, remote_args = parser.parse_known_args()
 
   devil_chromium.Initialize()
@@ -71,7 +73,7 @@ Otherwise: Writes command-line file.
 
   # Set flags.
   quoted_args = ' '.join(cmd_helper.SingleQuote(x) for x in remote_args)
-  flags_str = 'chrome %s' % quoted_args
+  flags_str = ' '.join([args.executable, quoted_args])
 
   def write_flags(device):
     device.WriteFile(args.device_path, flags_str, as_root=as_root)