[Touchless] Cancel fling when focusing carousel child.

Bug: 982357
Change-Id: Idea7394705b9421a0ce4837e79da7e4a8b2fe529
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694143Reviewed-by: Cathy Li <chili@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676065}

chrome/android/touchless/java/src/org/chromium/chrome/browser/touchless/SiteSuggestionsLayoutManager.java

@@ -57,6 +57,10 @@ class SiteSuggestionsLayoutManager extends RecyclerView.LayoutManager {
             RecyclerView parent, RecyclerView.State state, View child, View focused) {
         if (focused != null) {
             int newChildPos = getPosition(focused);
+
+            // Stop scrolling if we're in the middle of a swipe/fling, see https://crbug.com/982357.
+            parent.stopScroll();
+
             scrollToPosition(newChildPos);
         }
         return true;