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This CL adds support for passing text highlight information from
PDFiumEngine to mimehandler process using appropriate
AccessibilityHighlightInfo structs. Add
GetAccessibilityHighlightInfo() which works similar to
GetAccessibilityLinkInfo() called from within GetAccessibilityInfo() in
pdf/accessibility.cc. Also includes corresponding unit test.

Bug: 1008775
Change-Id: I7916177fef5e864f0e3b4b0a0b8c1693bf09f19c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871492Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Kalpak Tapas <katapas@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#720886}