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This CL adds GetAccessibilityTextFieldInfo() for fetching text field
information from PDFiumEngine using AccessibilityTextFieldInfo struct.
GetAccessibilityTextFieldInfo() is called from within
GetAccessibilityInfo() to populate PrivateAccessibilityTextFieldInfo.
The CL also includes corresponding unit test.

Bug: 1030242
Change-Id: Iafab8645f42c3720482f7e180d94587380f58de9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2084671
Commit-Queue: Mansi Awasthi <maawas@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#751055}