MD Settings: Pointers: Avoid setting mouse swap pref while mouse pressed

chrome/browser/resources/settings/device_page/pointers.html

Index: chrome/browser/resources/settings/device_page/pointers.html
diff --git a/chrome/browser/resources/settings/device_page/pointers.html b/chrome/browser/resources/settings/device_page/pointers.html
index fd94a40c81aaa9c0d600f387e39c71395fe21c8f..6c7eaa1026f001b3fc7e782f652df978f9d3174a 100644
--- a/chrome/browser/resources/settings/device_page/pointers.html
+++ b/chrome/browser/resources/settings/device_page/pointers.html
@@ -29,9 +29,14 @@
       <!-- Subsection title only appears if both mouse and touchpad exist. -->
       <h2 hidden$="[[!hasTouchpad]]">$i18n{mouseTitle}</h2>
       <div class="settings-box first">
-        <settings-toggle-button class="start"
+        <!-- Do not change the mouse button pref before the mouse is released.
+             See crbug.com/686949 -->
+        <settings-toggle-button id="mouseSwapButton" class="start"
             pref="{{prefs.settings.mouse.primary_right}}"
-            label="$i18n{mouseSwapButtons}">
+            label="$i18n{mouseSwapButtons}"
+            on-settings-boolean-control-change="onMouseSwapButtonsChange_"
+            on-down="onMouseSwapButtonsDown_" on-up="onMouseSwapButtonsUp_"
+            no-set-pref>
         </settings-toggle-button>
       </div>
       <div class="settings-box">