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This CL uses PdfAccessibilityPageObjects struct in the renderer side of
PDF a11y. Currently the members of PdfAccessibilityImageInfo struct are
passed and used accordingly as needed. More members would be added in
struct in the coming future to enable annotation support for PDF a11y.

Bug: 1008775
Change-Id: I0388adaebf981a85e4f4a2f7ab7b965ebb40fa0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890380Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#718082}