[RootLayerScrolls] Annotate non-fast-scroll regions to correct layer

third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html

Index: third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html
diff --git a/third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html b/third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html
index 3b711c5dfb84f0592533f3779cd755c0299ee342..a824b479957d9961c978a9b90fa175e2d1b93e46 100644
--- a/third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html
+++ b/third_party/WebKit/LayoutTests/scrollingcoordinator/non-fast-scrollable-transform-changed.html
@@ -18,12 +18,17 @@
     width: 1000px;
     background: linear-gradient(to bottom, red, white);
   }
+
+  .spacer {
+    height: 2000px;
+  }
 </style>
 
 <div id='nonFastRegion'><div>This should be covered by a green overlay.</div></div>
 
 <p>A single square should be visible covered by a green overlay.</p>
 <div id="console"></div>
+<div class="spacer"></div>
 
 <script src="../resources/js-test.js"></script>
 <script src="../resources/run-after-layout-and-paint.js"></script>
@@ -71,4 +76,4 @@
       finishJSTest();
     }, 0);
   }
-</script>
+</script>