TimelinePanel: a fix for Frames mode overview. It kept old records.
TimelinePanel: a fix for Frames mode overview. It kept old records.

Frame mode overview has its own array of frames. We have to clear it
when we start new record session.

BUG=
R=alph@chromium.org

Review URL: https://codereview.chromium.org/136683002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@164965 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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