Update WebInputEventFactory on Mac for pinch gesture support

WebInputEventFactory::gestureEvent was added a long time ago but is
not currently used.  Remove the existing unused code and update the
function to support creating GesturePinchUpdate events from Cocoa
NSEventTypeMagnify events.

BUG=289887

Review URL: https://codereview.chromium.org/184983003

git-svn-id: svn://svn.chromium.org/blink/trunk@168482 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: remove color generator from timeline flame chart.

R=loislo@chromium.org

Review URL: https://codereview.chromium.org/187473005

git-svn-id: svn://svn.chromium.org/blink/trunk@168483 bbb929c8-8fbe-4397-9dbb-9b2b20218538
TimelineFlameChart: selectRecord implementation.

BUG=349392
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/183763036

git-svn-id: svn://svn.chromium.org/blink/trunk@168484 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Skip Web Notification layout tests which will break due to test runner changes.

BUG=349015
R=mvanouwerkerk@chromium.org

Review URL: https://codereview.chromium.org/183683018

git-svn-id: svn://svn.chromium.org/blink/trunk@168485 bbb929c8-8fbe-4397-9dbb-9b2b20218538