Fix adb_chrome_public_command_line for Android M & refactor into a helper .sh

build/android/adb_android_webview_command_line

Index: build/android/adb_android_webview_command_line
diff --git a/build/android/adb_android_webview_command_line b/build/android/adb_android_webview_command_line
index 947cfb1eed7c39ed43a9c7dc4e8284016c3140d8..791e27069e2b7c6806179d151c90fadc569d1e47 100755
--- a/build/android/adb_android_webview_command_line
+++ b/build/android/adb_android_webview_command_line
@@ -13,25 +13,8 @@
 # To remove all content shell flags, pass an empty string for the flags:
 #   adb_android_webview_command_line ""
 
+. $(dirname $0)/adb_command_line_functions.sh
 CMD_LINE_FILE=/data/local/tmp/android-webview-command-line
-
-if [ $# -eq 0 ] ; then
-  # If nothing specified, print the command line (stripping off "content_shell")
-  tempfile=$(tempfile)
-  adb pull $CMD_LINE_FILE $tempfile 2>/dev/null
-  if [ $? -eq 0 ] ; then
-    rm $tempfile
-    adb shell cat $CMD_LINE_FILE | cut -d " " -f "2-" 2>/dev/null
-  fi
-elif [ $# -eq 1 ] && [ "$1" = '' ] ; then
-  # If given an empty string, delete the command line.
-  set -x
-  adb shell rm $CMD_LINE_FILE >/dev/null
-else
-  # Else set it.
-  set -x
-  adb shell "echo 'android_webview $*' > $CMD_LINE_FILE"
-  # Prevent other apps from modifying flags -- this can create security issues.
-  adb shell chmod 0664 $CMD_LINE_FILE
-fi
+REQUIRES_SU=0
+set_command_line "$@"