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This change adds struct PP_PrivateAccessibilityTextFieldInfo to
PP_PrivateAccessibilityPageObjects to transfer accessibility related PDF
text field data from the plugin process to the mimehandler process. Made
the same changes to the C++ versions of these structs and added the
appropriate conversion code.

Bug: 1030242
Change-Id: I50c9e82a9416445394b9cd1747606fc6d3706ef2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032463Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Mansi Awasthi <maawas@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#738857}