Remove document.rootScroller compositing clipping effects.

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

 // Copyright 2016 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 "bindings/core/v8/NodeOrString.h"
 #include "core/dom/ClientRect.h"
 #include "core/frame/BrowserControls.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/RootFrameViewport.h"
@@ skipping 724 matching lines @@
     // ViewportScrollCallback removed.  Keep the scrolls to guard crashes
     // but the expectations on when a ViewportScrollCallback have changed
     // and should be updated.
     // EXPECT_EQ(200, container->scrollTop());
   }
 
   // Reset explicitly to prevent lifetime issues with the RemoteFrameClient.
   m_helper.reset();
 }
 
-GraphicsLayer* scrollingLayer(LayoutView& layoutView) {
-  if (RuntimeEnabledFeatures::rootLayerScrollingEnabled())
-    return layoutView.layer()->compositedLayerMapping()->scrollingLayer();
-  return layoutView.compositor()->rootContentLayer();
-}
-
-// Tests that clipping layers belonging to any compositors in the ancestor chain
-// of the global root scroller have their masking bit removed.
-TEST_F(RootScrollerTest, RemoveClippingOnCompositorLayers) {
-  initialize("root-scroller-iframe.html");
-
-  HTMLFrameOwnerElement* iframe = toHTMLFrameOwnerElement(
-      mainFrame()->document()->getElementById("iframe"));
-  Element* container = iframe->contentDocument()->getElementById("container");
-
-  RootScrollerController& mainController =
-      mainFrame()->document()->rootScrollerController();
-  RootScrollerController& childController =
-      iframe->contentDocument()->rootScrollerController();
-  TopDocumentRootScrollerController& globalController =
-      page().globalRootScrollerController();
-
-  LayoutView* mainLayoutView = mainFrameView()->layoutView();
-  LayoutView* childLayoutView = iframe->contentDocument()->layoutView();
-  PaintLayerCompositor* mainCompositor = mainLayoutView->compositor();
-  PaintLayerCompositor* childCompositor = childLayoutView->compositor();
-
-  NonThrowableExceptionState nonThrow;
-
-  // No root scroller set, on the main frame the root content layer should
-  // clip. Additionally, on the child frame, the overflow controls host and
-  // container layers should also clip.
-  {
-    EXPECT_TRUE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_TRUE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_TRUE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_TRUE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-
-  // Now set the root scrollers such that the container in the iframe is the
-  // global root scroller. All the previously clipping layers in both paint
-  // layer compositors should no longer clip.
-  {
-    iframe->contentDocument()->setRootScroller(container, nonThrow);
-    mainFrame()->document()->setRootScroller(iframe, nonThrow);
-    mainFrameView()->updateAllLifecyclePhases();
-
-    ASSERT_EQ(iframe, &mainController.effectiveRootScroller());
-    ASSERT_EQ(container, &childController.effectiveRootScroller());
-
-    EXPECT_FALSE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_FALSE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-
-  // Now reset the iframe's root scroller. Since the iframe itself is now the
-  // global root scroller we want it to behave as if it were the main frame,
-  // which means it should clip only on its root content layer.
-  {
-    iframe->contentDocument()->setRootScroller(nullptr, nonThrow);
-    mainFrameView()->updateAllLifecyclePhases();
-
-    ASSERT_EQ(iframe, &mainController.effectiveRootScroller());
-    ASSERT_EQ(iframe->contentDocument(),
-              &childController.effectiveRootScroller());
-    ASSERT_EQ(iframe->contentDocument()->documentElement(),
-              globalController.globalRootScroller());
-
-    EXPECT_FALSE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_TRUE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-
-  // Now reset the main frame's root scroller. Its compositor should go back
-  // to clipping as well. Because the iframe is now no longer the global root
-  // scroller, it should go back to clipping its overflow host and container
-  // layers. This checks that we invalidate the compositing state even though
-  // the iframe's effective root scroller hasn't changed.
-
-  {
-    mainFrame()->document()->setRootScroller(nullptr, nonThrow);
-    mainFrameView()->updateAllLifecyclePhases();
-
-    ASSERT_EQ(mainFrame()->document(), &mainController.effectiveRootScroller());
-    ASSERT_EQ(iframe->contentDocument(),
-              &childController.effectiveRootScroller());
-    ASSERT_EQ(mainFrame()->document()->documentElement(),
-              globalController.globalRootScroller());
-
-    EXPECT_TRUE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_TRUE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_TRUE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_TRUE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-
-  // Set the iframe back as the main frame's root scroller. Since its the
-  // global root scroller again, it should clip like the root frame. This
-  // checks that we invalidate the compositing state even though the iframe's
-  // effective root scroller hasn't changed.
-  {
-    mainFrame()->document()->setRootScroller(iframe, nonThrow);
-    mainFrameView()->updateAllLifecyclePhases();
-
-    ASSERT_EQ(iframe, &mainController.effectiveRootScroller());
-    ASSERT_EQ(iframe->contentDocument(),
-              &childController.effectiveRootScroller());
-    ASSERT_EQ(iframe->contentDocument()->documentElement(),
-              globalController.globalRootScroller());
-
-    EXPECT_FALSE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_TRUE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-
-  // Set just the iframe's root scroller. We should stop clipping the
-  // iframe's compositor's layers but not the main frame's.
-  {
-    mainFrame()->document()->setRootScroller(nullptr, nonThrow);
-    iframe->contentDocument()->setRootScroller(container, nonThrow);
-    mainFrameView()->updateAllLifecyclePhases();
-
-    ASSERT_EQ(mainFrame()->document(), &mainController.effectiveRootScroller());
-    ASSERT_EQ(container, &childController.effectiveRootScroller());
-
-    EXPECT_TRUE(
-        scrollingLayer(*mainLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        mainCompositor->containerLayer()->platformLayer()->masksToBounds());
-
-    EXPECT_FALSE(
-        scrollingLayer(*childLayoutView)->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->rootGraphicsLayer()->platformLayer()->masksToBounds());
-    EXPECT_FALSE(
-        childCompositor->containerLayer()->platformLayer()->masksToBounds());
-  }
-}
-
 // Tests that the clipping layer is resized on the root scroller element even
 // if the layout height doesn't change.
 TEST_F(RootScrollerTest, BrowserControlsResizeClippingLayer) {
   bool oldInertTopControls = RuntimeEnabledFeatures::inertTopControlsEnabled();
   RuntimeEnabledFeatures::setInertTopControlsEnabled(true);
 
   initialize("root-scroller.html");
   Element* container = mainFrame()->document()->getElementById("container");
 
   {
@@ skipping 366 matching lines @@
   // FrameView without a layout.
   iframe->remove();
 
   EXPECT_EQ(mainFrameView()->layoutViewportScrollableArea(),
             &mainFrameView()->getRootFrameViewport()->layoutViewport());
 }
 
 }  // namespace
 
 }  // namespace blink