Implement style recalc invalidation tracking in devtools

Implement style recalc invalidation tracking in devtools

This patch adds style recalc invalidation tracking to the invalidation
tracking experiment. Our full design doc is at:
https://docs.google.com/document/d/1BXT3_gD--YdbIYMlTzNGsyUUMBCZJ7V5qGJhMA-pGrs/edit

This patch implements the invalidation tracking logic for style recalc
events. All style invalidations are recorded and when a style recalc
occurs they are collected and displayed to the user. Additional
style invalidation information (e.g., detailed reasons) will be added
in a followup.

The existing invalidation tests have been renamed because they are
only for paint events. A new test has been added for style recalc
events.

BUG=410701
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184212

[pdr., 2014-10-22 04:25:00]

pdr@chromium.org changed reviewers:
+ caseq@chromium.org, kouhei@chromium.org, yurys@chromium.org

[pdr., 2014-10-22 04:32:38]

PTAL. I expected this to be more difficult but it appears to be pretty simple.

The test diffs are indecipherable in Rietveld... here's the secret Rietveld diff
decoder ring:
Renames:
timeline-layout-invalidations.html ->
timeline-paint-with-layout-invalidations.html
timeline-style-recalc-invalidations.html ->
timeline-paint-with-style-recalc-invalidations.html
timeline-layout-deleted-node-invalidations.html ->
timeline-paint-with-layout-invalidations-on-deleted-node.html
New:
timeline-style-recalc-with-invalidations.html

[kouhei (in TOK), 2014-10-22 05:06:28]

Event join logic lgtm.
caseq, yurys: Would you take a look?

[yurys, 2014-10-22 05:55:56]

lgtm

[pdr., 2014-10-22 17:15:34]

The CQ bit was checked by pdr@chromium.org

[commit-bot: I haz the power, 2014-10-22 17:16:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/653283005/20001

[commit-bot: I haz the power, 2014-10-22 19:14:04]

Committed patchset #2 (id:20001) as 184212