[android] Fix the adb_gdb script.

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, or adb_gdb_drt
@@ skipping 341 matching lines @@
   # Nit: accept Chromium's 'ia32' as a valid target architecture. This
   # script prefers the NDK 'x86' name instead because it uses it to find
   # NDK-specific files (host gdb) with it.
   if [ "$TARGET_ARCH" = "ia32" ]; then
     TARGET_ARCH=x86
     log "Auto-config: --arch=$TARGET_ARCH  (equivalent to ia32)"
   fi
 fi
 
 # Detect the NDK system tag, i.e. the name used to identify the host.
-# out: NDK system tag (e.g. 'linux-x86').
+# out: NDK system tag (e.g. 'linux-x86_64').
 get_ndk_host_tag () {
   if [ -z "$NDK_HOST_TAG" ]; then
     case $(uname -s) in
-      Linux) NDK_HOST_TAG=linux-x86;;
+      Linux) NDK_HOST_TAG=linux-x86_64;;
       Darwin) NDK_HOST_TAG=darwin-x86;;
       *) panic "You can't run this script on this system: $uname -a";;
     esac
   fi
   echo "$NDK_HOST_TAG"
 }
 
 # Convert an NDK architecture name into a GNU configure triplet.
 # $1: NDK architecture name (e.g. 'arm')
 # Out: Android GNU configure triplet (e.g. 'arm-linux-androideabi')
@@ skipping 509 matching lines @@
   echo "### START $COMMANDS"
   cat $COMMANDS
   echo "### END $COMMANDS"
 fi
 
 log "Launching gdb client: $GDB $GDBARGS -x $COMMANDS"
 $GDB $GDBARGS -x $COMMANDS &&
 rm -f "$GDBSERVER_PIDFILE"
 
 clean_exit $?