Push API: add registration and error objects.

BUG=350378

Review URL: https://codereview.chromium.org/219163004

git-svn-id: svn://svn.chromium.org/blink/trunk@170778 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Show GPU memory limit on timline counters graph.

Review URL: https://codereview.chromium.org/219733003

git-svn-id: svn://svn.chromium.org/blink/trunk@170779 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: follow up to r170772, fixing interactive ui tests fyi bot.

TBR=

Review URL: https://codereview.chromium.org/223823005

git-svn-id: svn://svn.chromium.org/blink/trunk@170780 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename FontDescription fields s_variant and m_italic.

s_variant is not a static field. It should be named m_variant.
(This appears to be a recent typo.)

m_italic's getter was renamed "style".
It probably makes sense for the field to follow suit.

BUG=

Review URL: https://codereview.chromium.org/223173002

git-svn-id: svn://svn.chromium.org/blink/trunk@170781 bbb929c8-8fbe-4397-9dbb-9b2b20218538