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This patch implements LayoutText::GetUpperLeftCorner for LayoutNG.

Spartial navigation, scroll to anchor, Inspector, and some others
use this function.

The existing code for legacy was incorrect for vertical flow as
callers expect physical with flipped block, and the code uses
LineTop (logical top) as physical Y. This patch includes the fix
and a unit test.

This is another step to port InlineBox code to LayoutNG, started
when Aleks hit a bug by unported code.

Bug: 636993
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_layout_ng;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I658a58fd8bd5582d51e973bf97e3a4e97107603e
Reviewed-on: https://chromium-review.googlesource.com/981332Reviewed-by: Aleks Totic <atotic@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546129}