Mark virtual/deferred/inspector/timeline/timeline-paint.html as NeedsManualRebaseline

This test's expectations are changed to include a stackTrace by
the chromium CL https://codereview.chromium.org/266243002/

R=enne
BUG=370130
NOTRY=true

Review URL: https://codereview.chromium.org/262323002

git-svn-id: svn://svn.chromium.org/blink/trunk@173755 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Added pinch viewport offset to history item.

Added field to HistoryItem to save pinch viewport's offset within the main
frame and patched up the history system to be aware of the pinch viewport.

Also, removed "savedScrollAndScale" dead code from WebView

Follow-up Chromium patch: https://codereview.chromium.org/266673014

BUG=364112

Review URL: https://codereview.chromium.org/263853008

git-svn-id: svn://svn.chromium.org/blink/trunk@173757 bbb929c8-8fbe-4397-9dbb-9b2b20218538