Add a snapshot of flutter/engine/src/build to our sdk

build/android/adb_chrome_shell_command_line

Index: build/android/adb_chrome_shell_command_line
diff --git a/build/android/adb_chrome_shell_command_line b/build/android/adb_chrome_shell_command_line
new file mode 100755
index 0000000000000000000000000000000000000000..750f90603657078a8c8d9f24d1e98a63f5da3ba0
--- /dev/null
+++ b/build/android/adb_chrome_shell_command_line
@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# Copyright 2014 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 chrome shell flags.
+#
+# Otherwise, the given flags are used to REPLACE (not modify) the chrome shell
+# flags. For example:
+#   adb_chrome_shell_command_line --enable-webgl
+#
+# To remove all chrome shell flags, pass an empty string for the flags:
+#   adb_chrome_shell_command_line ""
+
+. $(dirname $0)/adb_command_line_functions.sh
+CMD_LINE_FILE=/data/local/tmp/chrome-shell-command-line
+REQUIRES_SU=0
+set_command_line "$@"
+