commit 4b34e4b56319572e06425dd77e4d3b30d86ce049
author ymalik <ymalik@chromium.org> Fri Jul 22 18:35:05 2016
committer Commit bot <commit-bot@chromium.org> Fri Jul 22 18:37:14 2016
tree ee4b0bd5b848e6ebbc29b0f334a16cd2e1936a06
parent f7cded9c30206fee15747b55f1ceb05aa054e30a

FrameView shouldn't apply scroll anchoring when root layer scrolling is enabled

Before this patch, when root layer scrolling was enabled, both FV and PLSA would
perform scroll anchoring. FV doesn't need perform scroll anchoring for the main
frame because PLSA will do the right thing.

This issue was found because the following tests failed when ScrollAnchoring was
turned on by default:
virtual/rootlayerscrolls/fast/scrolling/scroll-into-view-collapsed-div.html
virtual/rootlayerscrolls/fast/scrolling/fractional-scroll-offset-document.html

BUG=597479,558575

Review-Url: https://codereview.chromium.org/2176523003
Cr-Commit-Position: refs/heads/master@{#407211}