Updating trunk VERSION from 3254.0 to 3255.0

TBR=anantha@chromium.org

Change-Id: I11bb89a9d0ca34ea50e188293f21b844053c9245
Reviewed-on: https://chromium-review.googlesource.com/745941Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512728}

chrome/VERSION

 MAJOR=64
 MINOR=0
-BUILD=3254
+BUILD=3255
 PATCH=0