Fix adb_gdb --su-prefix

build/android/adb_gdb

 #!/bin/bash
 #
 # Copyright (c) 2012 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.
 #
 
 # A generic script used to attach to a running Chromium process and
 # debug it. Most users should not use this directly, but one of the
 # wrapper scripts like adb_gdb_content_shell
@@ skipping 302 matching lines @@
   --script=<file>       Specify extra GDB init script.
 
   --gdbserver=<file>    Specify target gdbserver binary.
   --gdb=<file>          Specify host gdb client binary.
   --target-arch=<name>  Specify NDK target arch.
   --adb=<file>          Specify host ADB binary.
 
   --su-prefix=<prefix>  Prepend <prefix> to 'adb shell' commands that are
                         run by this script. This can be useful to use
                         the 'su' program on rooted production devices.
+                        e.g. --su-prefix="su -c"
 
   --pull-libs           Force system libraries extraction.
   --no-pull-libs        Do not extract any system library.
   --libs-dir=<path>     Specify system libraries extraction directory.
 
   --debug               Use libraries under out/Debug.
   --release             Use libraries under out/Release.
 
 EOF
   exit 0
@@ skipping 512 matching lines @@
 if [ "$SU_PREFIX" ]; then
   # Need to check that this works properly.
   SU_PREFIX_TEST_LOG=$TMPDIR/su-prefix.log
   adb_shell $SU_PREFIX echo "foo" > $SU_PREFIX_TEST_LOG 2>&1
   if [ $? != 0 -o "$(cat $SU_PREFIX_TEST_LOG)" != "foo" ]; then
     echo "ERROR: Cannot use '$SU_PREFIX' as a valid su prefix:"
     echo "$ adb shell $SU_PREFIX echo foo"
     cat $SU_PREFIX_TEST_LOG
     exit 1
   fi
-  COMMAND_PREFIX=$SU_PREFIX
+  COMMAND_PREFIX="$SU_PREFIX"
 else
   SHELL_UID=$(adb shell cat /proc/self/status | \
               awk '$1 == "Uid:" { print $2; }')
   log "Shell UID: $SHELL_UID"
   if [ "$SHELL_UID" != 0 -o -n "$NO_ROOT" ]; then
     COMMAND_PREFIX="run-as $PACKAGE_NAME"
   else
     COMMAND_PREFIX=
   fi
 fi
@@ skipping 121 matching lines @@
 
 if [ "$VERBOSE" -gt 0 ]; then
   echo "### START $COMMANDS"
   cat $COMMANDS
   echo "### END $COMMANDS"
 fi
 
 log "Launching gdb client: $GDB $GDB_ARGS -x $COMMANDS"
 $GDB $GDB_ARGS -x $COMMANDS &&
 rm -f "$GDBSERVER_PIDFILE"