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layer-tree-model.js:
This test dumps the layer tree and associated elements. With root
layer scrolling (RLS), the layers are associated with different
elements (e.g., the iframe scrolling contents layer is "#document"
instead of "iframe#frame") and there are a different number of
layers, but the test passes otherwise.

layer-compositing-reasons.js:
This test dumps the compositing reasons for all layers, directly from
the GraphicsLayer object. With RLS, the root layer has two additional
reasons: overflowScrollingTouch and rootScroller.

Bug: 781428
Change-Id: Ibc1e654474c96d2dd8dfdfc01ec52046989c30cb
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Reviewed-on: https://chromium-review.googlesource.com/804620
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521914}