DevTools: align hidpi timeline memory overview with non-hidpi.

Review URL: https://codereview.chromium.org/232683006

git-svn-id: svn://svn.chromium.org/blink/trunk@171331 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: fix css auto-save behavior

This patch fixes throttling behavior for workingCopyChanged events for
StyleSourceMapping.

BUG=361578

Review URL: https://codereview.chromium.org/233193005

git-svn-id: svn://svn.chromium.org/blink/trunk@171332 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: GamepadEvent::m_gamepad should be PersistentWillBeMember

Since the Event hierarchy is not yet on the heap in non-oilpan builds,
we need to use PersistentWillBeMember for GamepadEvent::m_gamepad.
This was detected by Ian's plugin.

BUG=340522

Review URL: https://codereview.chromium.org/234683003

git-svn-id: svn://svn.chromium.org/blink/trunk@171333 bbb929c8-8fbe-4397-9dbb-9b2b20218538