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In many situations two views are constrained by three sides, and:
a) the fourth side is constraint to another view
b) the fourth side is constraint with an offset

This implements a new helper:
void AddSameConstraintsToSidesWithInsets(
    id<LayoutGuideProvider> innerView,
    id<LayoutGuideProvider> outerView,
    ios::LayoutSides sides,
    ios::ChromeDirectionalEdgeInsets insets);

This should allow writing things like:

AddSameConstraintsToSidesWithInsets(view1, view2,
  LayoutSides::kTop|LayoutSides::kLeading,
  ChromeDirectionalEdgeInsets{10, 5, 8, 8});

and a simplified version with no insets:

AddSameConstraintsToSides(view1, view2,
  LayoutSides::kTop|LayoutSides::kLeading);

These helpers should reduce boilerplate in layout code.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If1ef5427dde1fe7e098f212b6917d9566d1df0e6
Reviewed-on: https://chromium-review.googlesource.com/859789
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537328}