commit f9a5a3f987c9c5c4af122effef4440d97838e568
author Marijn Kruisselbrink <mek@chromium.org> Mon Feb 13 21:57:39 2017
committer Marijn Kruisselbrink <mek@chromium.org> Mon Feb 13 21:57:39 2017
tree 14ee90bfa03bf66e61318feca4514c8920a9ed15
parent ee4a11844083775b5294e0d25d45e75e095f8f65

Add a use counter and histogram to FileReaderSync.

To hopefully eventually facilitate removing FileReaderSync from service
workers this adds both a use counter and histogram to log how often the
API is used in the various worker types.

BUG=688586

Review-Url: https://codereview.chromium.org/2682223006
Cr-Commit-Position: refs/heads/master@{#449833}
(cherry picked from commit 77f740e334ba6fdb4d6493372e8009c544939ed4)

Review-Url: https://codereview.chromium.org/2694093002 .
Cr-Commit-Position: refs/branch-heads/2987@{#489}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}