TimelinePanel: REGRESSIONS: three fixes for TimelineOverviewPane.

TimelinePanel: REGRESSIONS: three fixes for TimelineOverviewPane.

1) Selected window doesn't slide while recording. Why: there used to be a call for _updateWindow from _update method.
2) No overview for Events mode. Why: raw records may have no valid endTime.
3) The window selection is dropping by recording timeline. Why: earlier overview pane saved the selected time range at _onWindowChanged.

BUG=
R=pfeldman@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168367

[pfeldman, 2014-03-04 06:26:51]

https://codereview.chromium.org/185543012/diff/1/Source/devtools/front_end/Ti...
File Source/devtools/front_end/TimelineModel.js (right):

https://codereview.chromium.org/185543012/diff/1/Source/devtools/front_end/Ti...
Source/devtools/front_end/TimelineModel.js:360: _updateBoundaries:
function(record)
This should be called on the WebInspector.TimlineModel.Record instead.

https://codereview.chromium.org/185543012/diff/1/Source/devtools/front_end/Ti...
File Source/devtools/front_end/TimelineOverviewPane.js (right):

https://codereview.chromium.org/185543012/diff/1/Source/devtools/front_end/Ti...
Source/devtools/front_end/TimelineOverviewPane.js:100: this._updateWindow();
This is strange since window has not changed. We should make the grid belong and
update from the modes so that _overviewControl.windowBoundaries was not exposed.

https://codereview.chromium.org/185543012/diff/1/Source/devtools/front_end/Ti...
Source/devtools/front_end/TimelineOverviewPane.js:156: this._windowStartTime =
windowTimes.startTime;
These three lines should be extracted (they are used in requestWindow times as
well).

[pfeldman, 2014-03-04 06:51:21]

lgtm

[loislo, 2014-03-04 07:10:59]

Committed patchset #1 manually as r168367 (presubmit successful).