tree 4eb364ea4def674590d8ead928f39247aad70c37
parent 352b6971deeb8e7438b6880fd4a26fd3f9382c47
author Dan Sinclair <dsinclair@chromium.org> 1484851982 -0500
committer Chromium commit bot <commit-bot@chromium.org> 1484855264 +0000

Add ObservedPtrs to PWL_CREATEPARAM

It's possible for both the provider and attached widget to be destroyed before
the PWL_CREATEPARAM objects which point to them. This causes issues when those
widgets access their attached widget or provider.

This CL wraps the pAttachedWidget and pProvider into ObservedPtrs so we will
know if the underlying pointer has gone away.

BUG=chromium:681351

Change-Id: Ib40445be9487dc3e89a66bb7407abdeed7d2c946
Reviewed-on: https://pdfium-review.googlesource.com/2270
Reviewed-by: Nicolás Peña <npm@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>