GitLab

Check to see if the |char_index| is within bounds, and return early if
it is. Otherwise, the code internal to PDFiumPage, which only works with
valid indices, will behave badly.

Bug: 996629
Change-Id: I71c27b1039e6d997d3ce5613e8df7a30882e8347
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767606
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#690041}