DevTools: Add support for search in shadow DOM in DevTools elements panel.

BUG=

Review URL: https://codereview.chromium.org/442463002

git-svn-id: svn://svn.chromium.org/blink/trunk@179599 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix oilpan build after stream changes.

R=haraken@chromium.org, tkent@chromium.org, yhirano@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/445913002

git-svn-id: svn://svn.chromium.org/blink/trunk@179600 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Show markers on Timeline overview in tracing based Timeline

TimelinePanel._addRecord was not called for divider events, on the other hand there is an explicit list of divider events exposed on TimelineModel.

BUG=399531
R=alph@chromium.org

Review URL: https://codereview.chromium.org/441803006

git-svn-id: svn://svn.chromium.org/blink/trunk@179601 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Use chrome's style buttons on panelEnablerView instead of oval's buttons

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/442453002

git-svn-id: svn://svn.chromium.org/blink/trunk@179602 bbb929c8-8fbe-4397-9dbb-9b2b20218538