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Previously we didn't know in what context said method was called, so we
didn't know if zoom ought to be applied or not.
Add LayoutSVGRoot::UnscaledIntrinsicSizingInfo and change current
callers of ComputeIntrinsicSizingInfo to use it. Then make
ComputeIntrinsicSizingInfo scale the intrinsic size.

Bug: 722055
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: If668e85bcea1028e48a3bc98c74d07435d425338
Reviewed-on: https://chromium-review.googlesource.com/1067397
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560331}