The length of the printed value can be determined from size of the type.

BUG=angleproject:2546

Change-Id: I39a4f9550f381dd82183f50019b3f7d117c52472
Reviewed-on: https://chromium-review.googlesource.com/1070220Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>