[Blink>Media] Adding rappor metrics to record autoplay muted by attribute usage

[Blink>Media] Adding rappor metrics to record autoplay muted by attribute usage

We need to analysis which sites are using autoplay muted by attribute.
This CL adds rappor metrics to record the eTLD+1 of the child frame and
top-level frame.

BUG=693889
Review-Url: https://codereview.chromium.org/2706593002
Cr-Commit-Position: refs/heads/master@{#452010}
(cherry picked from commit d0698b2368b6e48592d9c0231f63055fff323364)

Review-Url: https://codereview.chromium.org/2709013006 .
Cr-Commit-Position: refs/branch-heads/2987@{#660}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/3e0428dd812972101ac144c558345858e5b2f2a4

[Zhiqiang Zhang (Slow), 2017-02-23 15:47:25]

Description was changed from

==========
[Blink>Media] Adding rappor metrics to record autoplay muted by attribute usage

We need to analysis which sites are using autoplay muted by attribute.
This CL adds rappor metrics to record the eTLD+1 of the child frame and
top-level frame.

BUG=693889

Review-Url: https://codereview.chromium.org/2706593002
Cr-Commit-Position: refs/heads/master@{#452010}
(cherry picked from commit d0698b2368b6e48592d9c0231f63055fff323364)
==========

to

==========
[Blink>Media] Adding rappor metrics to record autoplay muted by attribute usage

We need to analysis which sites are using autoplay muted by attribute.
This CL adds rappor metrics to record the eTLD+1 of the child frame and
top-level frame.

BUG=693889

Review-Url: https://codereview.chromium.org/2706593002
Cr-Commit-Position: refs/heads/master@{#452010}
(cherry picked from commit d0698b2368b6e48592d9c0231f63055fff323364)

Review-Url: https://codereview.chromium.org/2709013006 .
Cr-Commit-Position: refs/branch-heads/2987@{#660}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/3e0428dd812972101ac144c55834...
==========

[Zhiqiang Zhang (Slow), 2017-02-23 15:47:26]

Committed patchset #1 (id:1) manually as
3e0428dd812972101ac144c558345858e5b2f2a4.