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This is a proposed output change for ChromeVox's treatment of both dialog and alert dialog roles.

When entering these types of containers, ChromeVox will output the text content of the dialog first, followed by the control with range.

R=akihiroota@chromium.org

Bug: none
AX-Relnotes: ChromeVox will now summarize the text content of a dialog when entering one.
Test: browser_tests --gtest_filter=ChromeVox*.DialogAuto*
Change-Id: Ic24f05bfb9f65e582239ed1e271ba4a78fefb034
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378730
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806025}