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This change adds struct PP_PrivateAccessibilityChoiceFieldInfo to
PP_PrivateAccessibilityFormFieldInfo to transfer accessibility related
PDF choice 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: I7aa6fd612de051d9e6b22e84e60c964d24685242
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214734
Commit-Queue: Mansi Awasthi <maawas@microsoft.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#774049}