[SPv2] Mark two tests as flaky

They flakily crash because of:
Check failed: layer_list_.empty() || *page_scale_factor == 1.

TBR: wangxianzhu@chromium.org
Bug: 706066
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I16e040451fdea20d1179c4fc531c120aba220386
Reviewed-on: https://chromium-review.googlesource.com/926907Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537836}

third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2

@@ -1110,6 +1110,8 @@ crbug.com/706066 compositing/geometry/fixed-position-iframe-composited-page-scal
 crbug.com/706066 compositing/geometry/fixed-position-transform-composited-page-scale-down.html [ Crash Timeout ]
 crbug.com/706066 compositing/geometry/fixed-position-transform-composited-page-scale.html [ Crash Timeout ]
 crbug.com/706066 compositing/scaling/tiled-layer-recursion.html [ Crash Timeout ]
+crbug.com/706066 fast/dom/elementFromPoint-scaled-scrolled.html [ Crash Pass ]
+crbug.com/706066 fast/dom/Element/scale-page-bounding-client-rect.html [ Crash Pass ]
 crbug.com/706066 fast/events/scale-and-scroll-body.html [ Crash Timeout ]
 crbug.com/706066 fast/events/scale-and-scroll-iframe-body.html [ Crash Timeout ]
 crbug.com/706066 fast/events/scale-and-scroll-iframe-window.html [ Crash Timeout ]