tree 44e90a7c4ba97ed9c11740c52fa3b8d455475334
parent ca6af90493d76b417824b0322be68e71d00cad41
author Dan Sinclair <dsinclair@chromium.org> 1485282367 -0500
committer dsinclair <dsinclair@chromium.org> 1485282722 +0000

[Merge M56] 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.

In order to merge I also had to add observed ptr copy and assign methods.

BUG=chromium:681351

Change-Id: Ic297753b5d020c5d9401cb3ff4d541b2498346e4
Reviewed-on: https://pdfium-review.googlesource.com/2351
Reviewed-by: Tom Sepez <tsepez@chromium.org>