[RootLayerScrolls] Fix frame scrolling layer in ScrollingCoordinator

third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js

Index: third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js
diff --git a/third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js b/third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js
index 51500d2f7478cfb76e2bcbde6e613db83b69e1c7..c556ecc903f1a7976cddb9105ac6d45d4546cab7 100644
--- a/third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js
+++ b/third_party/WebKit/LayoutTests/scrollingcoordinator/resources/non-fast-scrollable-region-testing.js
@@ -34,3 +34,11 @@ function rectToString(rect) {
     return '[' + [rect.left, rect.top, rect.width, rect.height].join(', ') + ']';
 }
 
+function sortRects(rects) {
+  Array.prototype.sort.call(rects, (a, b) => {

[skobes, 2017/01/28 02:00:04]

I thought of an easier way :)

Array.prototype.sort.call(rects, (a, b) => (
    a.height - b.height ||
    a.width - b.width ||
    a.top - b.top ||
    a.left - b.left));

+    return [
+      a.height - b.height, a.width - b.width, a.top - b.top, a.left - b.left
+    ].reduce((acc, val) => val || acc, 0);
+  });
+  return rects;
+}