cc : Add UMA metric for finding closest matching layer to a point

cc : Add UMA metric for finding closest matching layer to a point

The logic to find the closest matching layer is going to change. Adding
a UMA metric to track performance before and after the change.

BUG=685379
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2655853004
Cr-Commit-Position: refs/heads/master@{#447117}
(cherry picked from commit ee0ab199b6e9bd10d179fa1cfb379eff943d8b9e)

Review-Url: https://codereview.chromium.org/2672603007 .
Cr-Commit-Position: refs/branch-heads/2987@{#298}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/665e887dd3515599663477e67012a4d4288c1d6f

[jaydasika, 2017-02-03 20:11:23]

Description was changed from

==========
cc : Add UMA metric for finding closest matching layer to a point

The logic to find the closest matching layer is going to change. Adding
a UMA metric to track performance before and after the change.

BUG=685379
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2655853004
Cr-Commit-Position: refs/heads/master@{#447117}
(cherry picked from commit ee0ab199b6e9bd10d179fa1cfb379eff943d8b9e)
==========

to

==========
cc : Add UMA metric for finding closest matching layer to a point

The logic to find the closest matching layer is going to change. Adding
a UMA metric to track performance before and after the change.

BUG=685379
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2655853004
Cr-Commit-Position: refs/heads/master@{#447117}
(cherry picked from commit ee0ab199b6e9bd10d179fa1cfb379eff943d8b9e)

Review-Url: https://codereview.chromium.org/2672603007 .
Cr-Commit-Position: refs/branch-heads/2987@{#298}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/665e887dd3515599663477e67012...
==========

[jaydasika, 2017-02-03 20:11:25]

Committed patchset #1 (id:1) manually as
665e887dd3515599663477e67012a4d4288c1d6f.