cc: Enable composited border-radius scrolling.

third_party/WebKit/Source/web/tests/ScrollMetricsTest.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/ClientRect.h"
 #include "core/frame/LocalFrameView.h"
 #include "core/frame/WebLocalFrameBase.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/PaintLayerScrollableArea.h"
@@ skipping 301 matching lines @@
   EXPECT_WHEEL_TOTAL(2);
 }
 
 TEST_F(NonCompositedMainThreadScrollingReasonRecordTest, NestedScrollersTest) {
   SetUpHtml(
       "<style>"
       " .container { overflow:scroll; width: 200px; height: 200px; }"
       " .box { overflow:scroll; width: 100px; height: 100px; }"
       " .translucent { opacity: 0.5; }"
       " .transform { transform: scale(0.8); }"
-      " .with-border-radius { border: 5px solid; border-radius: 5px; }"
       " .spacer { height: 1000px; }"
       " .composited { will-change: transform; }"
       "</style>"
-      "<div id='container' class='container with-border-radius'>"
+      "<div id='container' class='container'>"
       "  <div class='translucent box'>"
       "    <div id='inner' class='composited transform box'>"
       "      <div class='spacer'></div>"
       "    </div>"
       "    <div class='spacer'></div>"
       "  </div>"
       "  <div class='spacer'></div>"
       "</div>");
 
   WebView().GetSettings()->SetAcceleratedCompositingEnabled(true);
   GetDocument().View()->SetParentVisible(true);
   GetDocument().View()->SetSelfVisible(true);
   GetDocument().View()->UpdateAllLifecyclePhases();
 
   Element* box = GetDocument().getElementById("inner");
   HistogramTester histogram_tester;
 
   Scroll(box, kWebGestureDeviceTouchpad);
   // Scrolling the inner box will gather reasons from the scrolling chain. The
   // inner box itself has no reason because it's composited. Other scrollable
   // areas from the chain have corresponding reasons.
   EXPECT_WHEEL_BUCKET(kHasOpacityAndLCDText, 1);
   EXPECT_WHEEL_BUCKET(kBackgroundNotOpaqueInRectAndLCDText, 1);
   EXPECT_WHEEL_BUCKET(kIsNotStackingContextAndLCDText, 1);
-  EXPECT_WHEEL_BUCKET(kHasBorderRadius, 1);
   EXPECT_WHEEL_BUCKET(kHasTransformAndLCDText, 0);
-  EXPECT_WHEEL_TOTAL(4);
+  EXPECT_WHEEL_TOTAL(3);
 }
 
 }  // namespace
 
 }  // namespace blink