Add DisableCompositingQueryAsserts to FrameView::useSlowRepaints

Android build hits this assertion all the time, rendering debug build useless.

This disabler isn't entirely correct, but assuming blitting-based scrolling
won't last long, it should be okay with a FIXME.

BUG=357345

Review URL: https://codereview.chromium.org/212223007

git-svn-id: svn://svn.chromium.org/blink/trunk@170626 bbb929c8-8fbe-4397-9dbb-9b2b20218538