Update the libmetrics API to match the new Chrome interface.

src/platform/init/chromeos_startup

 #!/bin/sh
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 HAS_INITRAMFS=0
 if [ -d /dev/.initramfs ]
 then
   # The initrd will have mounted /sys, /proc, and /dev for us.
@@ skipping 45 matching lines @@
 mkdir -p -m 0755 /mnt/stateful_partition/etc
 mkdir -p -m 0755 /mnt/stateful_partition/var/cache
 mkdir -p -m 0755 /mnt/stateful_partition/var/empty
 mkdir -p -m 0755 /mnt/stateful_partition/var/lib
 mkdir -p -m 0755 /mnt/stateful_partition/var/lock
 mkdir -p -m 0755 /mnt/stateful_partition/var/log
 mkdir -p -m 0755 /mnt/stateful_partition/var/tmp
 mkdir -p -m 0755 /mnt/stateful_partition/var/run
 chmod 0755 /mnt/stateful_partition/var
 
+# Directory for ChromeOS metrics collection
+mkdir -p -m 0755 /mnt/stateful_partition/var/log/metrics
+chown chronos:chronos /mnt/stateful_partition/var/log/metrics
+
 # Default to Pacific timezone if we don't have one set
 ! ln -s /usr/share/zoneinfo/US/Pacific /mnt/stateful_partition/etc/localtime \
     > /dev/null 2>&1
 
 # Mount some /var directories and /home
 mount -n --bind /mnt/stateful_partition/var /var
 mount -n -t tmpfs -omode=1777,nodev,noexec,nosuid vartmp /var/tmp
 mount -n --bind /mnt/stateful_partition/home /home
 
 # Mount stateful partition for dev packages
@@ skipping 17 matching lines @@
 (test -f "$SALT" || head -c 16 /dev/urandom > "$SALT") &
 
 # Write out uptime and disk stats pre/post startup
 cat /proc/uptime > /tmp/uptime-post-startup
 ! cat /sys/block/sda/stat > /tmp/disk-post-startup
 echo "$PRE_UPTIME_STAT" > /tmp/uptime-pre-startup
 echo "$PRE_DISK_STAT" > /tmp/disk-pre-startup
 
 # Always return success to avoid killing init
 exit 0