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This reverts commit fca998b7.

Reason for revert: crbug.com/931878, touch tab-dragging gets broken

Original change's description:
> Reland "chromeos: makes resizes smoother with mash"
> 
> This reverts commit 643813e1.
> 
> Reason for revert: My test was wrong, we actually block mouse on device in certain modes. Sorry for the noise.
> 
> Original change's description:
> > Revert "chromeos: makes resizes smoother with mash"
> > 
> > This reverts commit b805090b.
> > 
> > Reason for revert: This makes the mouse get stuck hidden on device.
> > 
> > Original change's description:
> > > chromeos: makes resizes smoother with mash
> > > 
> > > This contains two changes:
> > > 1. Adds call from ClientRoot to Compositor::OnChildResizing(). This ensures
> > >    that WindowTreeHost doesn't dispatch move events until the frame has been
> > >    activated.
> > > 2. Converts resetting of pointer moves lock from OnCompositingDidCommit()
> > >    to OnCompositingEnded(). OnCompositingDidCommit() seems to be called much
> > >    to earlier in the mash case, and results in jank when resizing.
> > > 
> > > BUG=929914
> > > TEST=none
> > > 
> > > Change-Id: I68d87d6e7f237f246c2fad6218d9da5356c98641
> > > Reviewed-on: https://chromium-review.googlesource.com/c/1467917
> > > Commit-Queue: Scott Violet <sky@chromium.org>
> > > Reviewed-by: Saman Sami <samans@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#631743}
> > 
> > TBR=sky@chromium.org,samans@chromium.org
> > 
> > Change-Id: Iaf103ed66885da652c7013fcc412b0269e10b303
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: 929914
> > Reviewed-on: https://chromium-review.googlesource.com/c/1470935
> > Reviewed-by: Scott Violet <sky@chromium.org>
> > Commit-Queue: Scott Violet <sky@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#631803}
> 
> TBR=sky@chromium.org,samans@chromium.org
> 
> Change-Id: I828256b878dfb8f5a8ec0bbd6c6c533e091ddb5f
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 929914
> Reviewed-on: https://chromium-review.googlesource.com/c/1471010
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#631820}

TBR=sky@chromium.org,samans@chromium.org

Change-Id: Id7eb67f636e13677122c6a8bd0c8e50bd4b51986
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 929914
Reviewed-on: https://chromium-review.googlesource.com/c/1471493Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632024}