This bug probably started in M65 and is certainly in M66+.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f6ebbb1d897c9ead6e241195f8604b412bb4b17

commit 8f6ebbb1d897c9ead6e241195f8604b412bb4b17
Author: Katie D <katie@chromium.org>
Date: Sat Mar 03 01:55:28 2018

Fix compatibility between Select-to-Speak and large mouse cursor.

The event rewriter needs to allow mouse movement events to pass even
when those events are used by Select-to-Speak. It should only cancel
mouse click events used by Select-to-Speak.

Another solution would be to re-write all used "drag" events to be
simply "move" events, which may reduce the likelyhood that these
events will be used by any other part of Chrome / Chrome OS besides
Select-to-Speak and drawing the mouse.

This bug also impacted some devices (like snappy) even without
large mouse cursor on.

Note: The additional "drag" and "move" events were manually tested
and do not appear to cause any behavior problems on tabs, the
launcher, system windows, etc.

Bug:  818329 
Change-Id: I466a15a0f7a5ba0abe4f082a9cfb9b59760d690c
Reviewed-on: https://chromium-review.googlesource.com/947210
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540714}
[modify] https://crrev.com/8f6ebbb1d897c9ead6e241195f8604b412bb4b17/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter.cc
[modify] https://crrev.com/8f6ebbb1d897c9ead6e241195f8604b412bb4b17/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter_unittest.cc

This bug requires manual review: We are only 2 days from stable.
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), bhthompson@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Your change meets the bar and is auto-approved for M66. Please go ahead and merge the CL to branch 3359 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), josafat@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I like the update but my Google processor is stopping suddenly

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ac163c647d2e3771e215e8a03f14d8e04ece02d6

commit ac163c647d2e3771e215e8a03f14d8e04ece02d6
Author: Katie D <katie@chromium.org>
Date: Mon Mar 05 17:36:43 2018

Merge to M66: Fix compatibility between Select-to-Speak and large mouse cursor.

The event rewriter needs to allow mouse movement events to pass even
when those events are used by Select-to-Speak. It should only cancel
mouse click events used by Select-to-Speak.

Another solution would be to re-write all used "drag" events to be
simply "move" events, which may reduce the likelyhood that these
events will be used by any other part of Chrome / Chrome OS besides
Select-to-Speak and drawing the mouse.

This bug also impacted some devices (like snappy) even without
large mouse cursor on.

Note: The additional "drag" and "move" events were manually tested
and do not appear to cause any behavior problems on tabs, the
launcher, system windows, etc.

TBR=dmazzoni@chromium.org

Bug:  818329 
Change-Id: I466a15a0f7a5ba0abe4f082a9cfb9b59760d690c
Reviewed-on: https://chromium-review.googlesource.com/947210
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#540714}(cherry picked from commit 8f6ebbb1d897c9ead6e241195f8604b412bb4b17)
Reviewed-on: https://chromium-review.googlesource.com/949079
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/branch-heads/3359@{#12}
Cr-Branched-From: 66afc5e5d10127546cc4b98b9117aff588b5e66b-refs/heads/master@{#540276}
[modify] https://crrev.com/ac163c647d2e3771e215e8a03f14d8e04ece02d6/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter.cc
[modify] https://crrev.com/ac163c647d2e3771e215e8a03f14d8e04ece02d6/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9a269719d5ad444bbbf46eb32cf685e715a08742

commit 9a269719d5ad444bbbf46eb32cf685e715a08742
Author: Katie D <katie@chromium.org>
Date: Mon Mar 05 18:53:35 2018

Merge to M65: Fix compatibility between Select-to-Speak and large mouse cursor.

The event rewriter needs to allow mouse movement events to pass even
when those events are used by Select-to-Speak. It should only cancel
mouse click events used by Select-to-Speak.

Another solution would be to re-write all used "drag" events to be
simply "move" events, which may reduce the likelyhood that these
events will be used by any other part of Chrome / Chrome OS besides
Select-to-Speak and drawing the mouse.

This bug also impacted some devices (like snappy) even without
large mouse cursor on.

Note: The additional "drag" and "move" events were manually tested
and do not appear to cause any behavior problems on tabs, the
launcher, system windows, etc.

TBR=dmazzoni@chromium.org

Bug:  818329 
Change-Id: I466a15a0f7a5ba0abe4f082a9cfb9b59760d690c
Reviewed-on: https://chromium-review.googlesource.com/947210
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#540714}(cherry picked from commit 8f6ebbb1d897c9ead6e241195f8604b412bb4b17)
Reviewed-on: https://chromium-review.googlesource.com/949542
Reviewed-by: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#661}
Cr-Branched-From: bc084a8b5afa3744a74927344e304c02ae54189f-refs/heads/master@{#530369}
[modify] https://crrev.com/9a269719d5ad444bbbf46eb32cf685e715a08742/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter.cc
[modify] https://crrev.com/9a269719d5ad444bbbf46eb32cf685e715a08742/chrome/browser/chromeos/accessibility/select_to_speak_event_rewriter_unittest.cc