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In a subsequent patch, the decision whether to ship a RenderFrameMetadata
to the browser process depends on on the scroll position relative to the edge
of the root layer. This complexity doesn't really belong in
cc::RenderFrameMetadata itself but rather its consumer. This CL moves the
code of whether to ship a RenderFrameMetadata out of the struct itself.

Bug: 672962
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I59b001088d3d83df7bd0dc9fe569e439af3fdeb9
Reviewed-on: https://chromium-review.googlesource.com/1115348Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570478}