DevTools: Buffer ViewportController to prevent whitespace on scroll.

DevTools: Buffer ViewportController to prevent whitespace on scroll.
This prevents the user from seeing the console messages load in as they scroll.

BUG=none

Committed: https://crrev.com/867f2dbb4ec7297619bf186b02d959b2f2f56ade
Cr-Commit-Position: refs/heads/master@{#419090}

[einbinder, 2016-09-15 20:45:29]

einbinder@chromium.org changed reviewers:
+ luoe@chromium.org, lushnikov@chromium.org

[einbinder, 2016-09-15 20:45:30]

ptal

[lushnikov, 2016-09-15 20:53:08]

https://codereview.chromium.org/2339293003/diff/20001/third_party/WebKit/Sour...
File third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js (right):

https://codereview.chromium.org/2339293003/diff/20001/third_party/WebKit/Sour...
third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js:433:
this._firstActiveIndex =
Math.max(Array.prototype.lowerBound.call(this._cumulativeHeights, visibleFrom +
1 - activeHeight / 4), 0);
like you said offline, you shouldn't divide by 4 here (2 is hidden inside 4!)

[lushnikov, 2016-09-15 20:53:17]

lgtm % comment

[einbinder, 2016-09-16 00:44:09]

The CQ bit was checked by einbinder@chromium.org

[einbinder, 2016-09-16 00:44:10]

The patchset sent to the CQ was uploaded after l-g-t-m from
lushnikov@chromium.org
Link to the patchset: https://codereview.chromium.org/2339293003/#ps40001
(title: "Fix math error")

[commit-bot: I haz the power, 2016-09-16 00:44:51]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-16 03:16:58]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-16 03:20:40]

Description was changed from

==========
DevTools: Buffer ViewportController to prevent whitespace on scroll.
This prevents the user from seeing the console messages load in as they scroll.

BUG=none
==========

to

==========
DevTools: Buffer ViewportController to prevent whitespace on scroll.
This prevents the user from seeing the console messages load in as they scroll.

BUG=none

Committed: https://crrev.com/867f2dbb4ec7297619bf186b02d959b2f2f56ade
Cr-Commit-Position: refs/heads/master@{#419090}
==========

[commit-bot: I haz the power, 2016-09-16 03:20:40]

Patchset 3 (id:??) landed as
https://crrev.com/867f2dbb4ec7297619bf186b02d959b2f2f56ade
Cr-Commit-Position: refs/heads/master@{#419090}