Cherry-pick: Fix RemoveFromScrollTree and RemoveFromClipTree

Clean cherry-pick of chromium
crrev.com/66133e86b6d79534605539aa684a248e6b6205bf

BUG: 17612259

Original description:

These functions should set needs commit, but didn't. This lead to stale
pointers in the impl tree.

Review URL: https://codereview.chromium.org/572483002

Change-Id: I59ba963f2ad44aa6f64366ca30c7a64a97570fb3
Cr-Commit-Position: refs/heads/master@{#294749}
4 files changed