Move TopDocumentRootScrollerController to a separate object on FrameHost

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp

 // Copyright 2014 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/layout/compositing/CompositedLayerMapping.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/api/LayoutViewItem.h"
@@ skipping 635 matching lines @@
     EXPECT_EQ(static_cast<GraphicsLayerPaintingPhase>(GraphicsLayerPaintOverflowContents | GraphicsLayerPaintCompositedScroll | GraphicsLayerPaintForeground), mapping->scrollingContentsLayer()->paintingPhase());
     EXPECT_FALSE(mapping->foregroundLayer());
 }
 
 // Make sure that clipping layers are removed or their masking bit turned off
 // when they're an ancestor of the root scroller element.
 TEST_F(CompositedLayerMappingTest, RootScrollerAncestorsNotClipped)
 {
     NonThrowableExceptionState nonThrow;
 
-    // TODO(bokan): Avoid cast once follow-up patch separates TDRSC from
-    // RootScrollerController.
-    TopDocumentRootScrollerController* rootScrollerController =
-        (TopDocumentRootScrollerController*)document().rootScrollerController();
+    TopDocumentRootScrollerController& rootScrollerController =
+        document().frameHost()->globalRootScrollerController();
 
     setBodyInnerHTML(
         // The container DIV is composited with scrolling contents and a
         // non-composited parent that clips it.
         "<div id='clip' style='overflow: hidden; width: 200px; height: 200px; position: absolute; left: 0px; top: 0px;'>"
         "    <div id='container' style='transform: translateZ(0); overflow: scroll; width: 300px; height: 300px'>"
         "        <div style='width: 2000px; height: 2000px;'>lorem ipsum</div>"
         "        <div id='innerScroller' style='width: 800px; height: 600px; left: 0px; top: 0px; position: absolute; overflow: scroll'>"
         "            <div style='height: 2000px; width: 2000px'></div>"
         "        </div>"
@@ skipping 55 matching lines @@
         EXPECT_TRUE(mapping2->scrollingLayer()->platformLayer()->masksToBounds());
         EXPECT_TRUE(mapping3->clippingLayer()->platformLayer()->masksToBounds());
     }
 
     // Set the inner scroller in the first container as the root scroller. Its
     // clipping layer should be removed and the scrolling layer should not
     // mask.
     {
         document().setRootScroller(innerScroller, nonThrow);
         document().view()->updateAllLifecyclePhases();
-        ASSERT_EQ(innerScroller, rootScrollerController->globalRootScroller());
+        ASSERT_EQ(innerScroller, rootScrollerController.globalRootScroller());
 
         EXPECT_FALSE(mapping->ancestorClippingLayer());
         EXPECT_FALSE(mapping->scrollingLayer()->platformLayer()->masksToBounds());
     }
 
     // Set the inner scroller in the second container as the root scroller. Its
     // scrolling layer should no longer mask. The clipping and scrolling layers
     // on the first container should now reset back.
     {
         document().setRootScroller(innerScroller2, nonThrow);
         document().view()->updateAllLifecyclePhases();
-        ASSERT_EQ(innerScroller2, rootScrollerController->globalRootScroller());
+        ASSERT_EQ(innerScroller2, rootScrollerController.globalRootScroller());
 
         EXPECT_TRUE(mapping->ancestorClippingLayer());
         EXPECT_TRUE(mapping->ancestorClippingLayer()->platformLayer()->masksToBounds());
         EXPECT_TRUE(mapping->scrollingLayer()->platformLayer()->masksToBounds());
 
         EXPECT_FALSE(mapping2->scrollingLayer()->platformLayer()->masksToBounds());
     }
 
     // Set the inner scroller in the third container as the root scroller. Its
     // clipping layer should be removed.
     {
         document().setRootScroller(innerScroller3, nonThrow);
         document().view()->updateAllLifecyclePhases();
-        ASSERT_EQ(innerScroller3, rootScrollerController->globalRootScroller());
+        ASSERT_EQ(innerScroller3, rootScrollerController.globalRootScroller());
 
         EXPECT_TRUE(mapping2->scrollingLayer()->platformLayer()->masksToBounds());
 
         EXPECT_FALSE(mapping3->clippingLayer());
     }
 
     // Unset the root scroller. The clipping layer on the third container should
     // be restored.
     {
         document().setRootScroller(nullptr, nonThrow);
         document().view()->updateAllLifecyclePhases();
-        ASSERT_EQ(document().documentElement(), rootScrollerController->globalRootScroller());
+        ASSERT_EQ(document().documentElement(), rootScrollerController.globalRootScroller());
 
         EXPECT_TRUE(mapping3->clippingLayer());
         EXPECT_TRUE(mapping3->clippingLayer()->platformLayer()->masksToBounds());
     }
 }
 
 } // namespace blink