DevTools: fix console to tail messages on devtools with zoomfactor != 1

This patch fixes method Element.isScrolledToBottom. The reason for this
fix is that both clientHeight and scrollHeight are rounded to integer
values.

BUG=349399

Review URL: https://codereview.chromium.org/180733003

git-svn-id: svn://svn.chromium.org/blink/trunk@168643 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: timeline frame selection does not work for aggregated frames

BUG=349938
R=caseq@chromium.org

Review URL: https://codereview.chromium.org/188793002

git-svn-id: svn://svn.chromium.org/blink/trunk@168645 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add more plumbing for FetchEvent including WebServiceWorkerResponse

This enables the browser to dispatch a FetchEvent
and receive a response.

BUG=342301

Review URL: https://codereview.chromium.org/185423005

git-svn-id: svn://svn.chromium.org/blink/trunk@168646 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Fix heap unit test that did not reset destructor call count.

R=erik.corry@gmail.com
BUG=

Review URL: https://codereview.chromium.org/177923003

git-svn-id: svn://svn.chromium.org/blink/trunk@168647 bbb929c8-8fbe-4397-9dbb-9b2b20218538