Log an immediate variant of FirstContentfulPaint.

Log an immediate variant of FirstContentfulPaint.

Our page load metrics are currently logged at the time a page is 'closed'.
For example, when a tab is closed, or when a page is navigated away from.
If a page stays open for a long period of time, we may log its metrics long
after the events for those metrics occurred. This may cause issues such as
logging metrics for events that happened on WiFi later, when the user is on
2G, or vice versa. We don't know how much of a problem this is, so to start,
we're adding a single metric to allow us to track the difference between
logging at the end of a page load and logging immediately after the page
event occurred. If the difference is significant, this may motivate us to
migrate other events to more immediate logging.

NOTRY=true
NOPRESUBMIT=true
BUG=609660
Review-Url: https://codereview.chromium.org/1953673003
Cr-Commit-Position: refs/heads/master@{#392330}
(cherry picked from commit 3e0a460bd23c5c2e25b8bf6b9813f8c78408a595)

[Bryan McQuade, 2016-05-10 18:14:13]

PTAL. This is a cherrypick into 2704.

[Charlie Harrison, 2016-05-10 18:27:43]

On 2016/05/10 18:14:13, Bryan McQuade wrote:
> PTAL. This is a cherrypick into 2704.

lgtm

[Charlie Harrison, 2016-05-10 18:27:44]

On 2016/05/10 18:14:13, Bryan McQuade wrote:
> PTAL. This is a cherrypick into 2704.

lgtm

[Bryan McQuade, 2016-05-10 18:55:04]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-05-10 18:55:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1961363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1961363003/1

[commit-bot: I haz the power, 2016-05-10 18:55:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-05-10 18:55:50]

CLs for remote refs other than refs/pending/heads/master must contain NOTRY=true
and NOPRESUBMIT=true in order for the CQ to process them

[Bryan McQuade, 2016-05-10 18:57:16]

Description was changed from

==========
Log an immediate variant of FirstContentfulPaint.

Our page load metrics are currently logged at the time a page is 'closed'.
For example, when a tab is closed, or when a page is navigated away from.
If a page stays open for a long period of time, we may log its metrics long
after the events for those metrics occurred. This may cause issues such as
logging metrics for events that happened on WiFi later, when the user is on
2G, or vice versa. We don't know how much of a problem this is, so to start,
we're adding a single metric to allow us to track the difference between
logging at the end of a page load and logging immediately after the page
event occurred. If the difference is significant, this may motivate us to
migrate other events to more immediate logging.

TBR=csharrison
BUG=609660

Review-Url: https://codereview.chromium.org/1953673003
Cr-Commit-Position: refs/heads/master@{#392330}
(cherry picked from commit 3e0a460bd23c5c2e25b8bf6b9813f8c78408a595)
==========

to

==========
Log an immediate variant of FirstContentfulPaint.

Our page load metrics are currently logged at the time a page is 'closed'.
For example, when a tab is closed, or when a page is navigated away from.
If a page stays open for a long period of time, we may log its metrics long
after the events for those metrics occurred. This may cause issues such as
logging metrics for events that happened on WiFi later, when the user is on
2G, or vice versa. We don't know how much of a problem this is, so to start,
we're adding a single metric to allow us to track the difference between
logging at the end of a page load and logging immediately after the page
event occurred. If the difference is significant, this may motivate us to
migrate other events to more immediate logging.

NOTRY=true
NOPRESUBMIT=true
BUG=609660

Review-Url: https://codereview.chromium.org/1953673003
Cr-Commit-Position: refs/heads/master@{#392330}
(cherry picked from commit 3e0a460bd23c5c2e25b8bf6b9813f8c78408a595)
==========

[Bryan McQuade, 2016-05-10 18:58:32]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-05-10 18:59:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1961363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1961363003/1

[commit-bot: I haz the power, 2016-05-10 19:01:20]

Committed patchset #1 (id:1)