Timeline: remove redundant header from frame statistics

Timeline: remove redundant header from frame statistics

- rename generatePopupContent.* to generateDetailsContent where appropriate;
- change generateDetailsContentForFrame to use TimelineDetailsContentHelper,
    thus removing redundant header;
- (drive-by) fix frame start time in case frames are built from trace events.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176397

[yurys, 2014-06-17 14:44:08]

lgtm

[caseq, 2014-06-17 14:56:58]

The CQ bit was checked by caseq@chromium.org

[commit-bot: I haz the power, 2014-06-17 14:57:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/caseq@chromium.org/341483005/1

[commit-bot: I haz the power, 2014-06-17 16:19:37]

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

[commit-bot: I haz the power, 2014-06-17 16:19:38]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/11713)

[caseq, 2014-06-18 05:41:31]

The CQ bit was checked by caseq@chromium.org

[commit-bot: I haz the power, 2014-06-18 05:41:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/caseq@chromium.org/341483005/20001

[commit-bot: I haz the power, 2014-06-18 06:47:01]

Change committed as 176397