DevTools: extract filters from TimelinePanel into a class for re-use

DevTools: extract filters from TimelinePanel into a class for re-use

Filters will only be shown for Events tab eventually, so extract these
into a separate class for ease of moving.

BUG=

Committed: https://crrev.com/3aeeedfb769904f6f5ae233d44731595eef1e295
Cr-Commit-Position: refs/heads/master@{#359350}

[caseq, 2015-11-09 22:08:49]

caseq@chromium.org changed reviewers:
+ alph@chromium.org

[alph, 2015-11-12 02:25:27]

lgtm

https://codereview.chromium.org/1433753002/diff/1/third_party/WebKit/Source/d...
File third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
(right):

https://codereview.chromium.org/1433753002/diff/1/third_party/WebKit/Source/d...
third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js:1964:
function textFilterChanged(event)
remove arg

[caseq, 2015-11-12 17:51:41]

The CQ bit was checked by caseq@chromium.org

[caseq, 2015-11-12 17:51:41]

The patchset sent to the CQ was uploaded after l-g-t-m from alph@chromium.org
Link to the patchset: https://codereview.chromium.org/1433753002/#ps20001
(title: "fixed tests, addressed review comments")

[commit-bot: I haz the power, 2015-11-12 17:52:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433753002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433753002/20001

[commit-bot: I haz the power, 2015-11-12 18:57:35]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-12 20:08:42]

Patchset 2 (id:??) landed as
https://crrev.com/3aeeedfb769904f6f5ae233d44731595eef1e295
Cr-Commit-Position: refs/heads/master@{#359350}