Remove more testRunner.display() calls from LayoutTests

These tests should continue to run correctly without rebaselines.

BUG=345027

Review URL: https://codereview.chromium.org/183703003

git-svn-id: svn://svn.chromium.org/blink/trunk@168232 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Lower the simultaneous rebaseline limit from 200 to 50, in hopes of making the
bot more likely to succeed at rebaselining.

BUG=none
TEST=none
TBR=ojan

Review URL: https://codereview.chromium.org/185173002

git-svn-id: svn://svn.chromium.org/blink/trunk@168233 bbb929c8-8fbe-4397-9dbb-9b2b20218538
RenderLayer::clipParent() should avoid calling clippedByAncestor unless needed

Calling clippedByAncestor is not free, we should avoid calling it unless
the compositingReasons() say we need to.

R=ojan@chromium.org,vollick@chromium.org,abarth@chromium.org

Review URL: https://codereview.chromium.org/183263003

git-svn-id: svn://svn.chromium.org/blink/trunk@168234 bbb929c8-8fbe-4397-9dbb-9b2b20218538