Fix crash about mask layers

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 "config.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
@@ skipping 190 matching lines @@
         "<div id='target' style='width: 10000px; height: 10000px; will-change: transform'></div></div>");
 
     document().view()->updateAllLifecyclePhases();
     Element* element = document().getElementById("target");
     PaintLayer* paintLayer = toLayoutBoxModelObject(element->layoutObject())->layer();
     ASSERT_TRUE(paintLayer->graphicsLayerBacking());
     // Offscreen layers are painted as usual.
     EXPECT_TRUE(checkRectsEqual(IntRect(0, 0, 4001, 4001), computeInterestRect(paintLayer->graphicsLayerBacking(), paintLayer->layoutObject())));
 }
 
+TEST_F(CompositedLayerMappingTest, ClippingMaskLayer)
+{
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+        return;
+
+    const AtomicString styleWithoutClipping = "backface-visibility: hidden; width: 200px; height: 200px";
+    const AtomicString styleWithBorderRadius = styleWithoutClipping + "; border-radius: 10px";
+    const AtomicString styleWithClipPath = styleWithoutClipping + "; -webkit-clip-path: inset(10px)";
+
+    setBodyInnerHTML("<video id='video' src='x' style='" + styleWithoutClipping + "'></video>");
+
+    document().view()->updateAllLifecyclePhases();
+    Element* videoElement = document().getElementById("video");
+    GraphicsLayer* graphicsLayer = toLayoutBoxModelObject(videoElement->layoutObject())->layer()->graphicsLayerBacking();
+    EXPECT_FALSE(graphicsLayer->maskLayer());
+    EXPECT_FALSE(graphicsLayer->contentsClippingMaskLayer());
+
+    videoElement->setAttribute(HTMLNames::styleAttr, styleWithBorderRadius);
+    document().view()->updateAllLifecyclePhases();
+    EXPECT_FALSE(graphicsLayer->maskLayer());
+    EXPECT_TRUE(graphicsLayer->contentsClippingMaskLayer());
+
+    videoElement->setAttribute(HTMLNames::styleAttr, styleWithClipPath);
+    document().view()->updateAllLifecyclePhases();
+    EXPECT_TRUE(graphicsLayer->maskLayer());
+    EXPECT_FALSE(graphicsLayer->contentsClippingMaskLayer());
+
+    videoElement->setAttribute(HTMLNames::styleAttr, styleWithoutClipping);
+    document().view()->updateAllLifecyclePhases();
+    EXPECT_FALSE(graphicsLayer->maskLayer());
+    EXPECT_FALSE(graphicsLayer->contentsClippingMaskLayer());
+}
+
 TEST_F(CompositedLayerMappingTest, InterestRectChangedEnoughToRepaintEmpty)
 {
     IntSize layerSize(1000, 1000);
     // Both empty means there is nothing to do.
     EXPECT_FALSE(interestRectChangedEnoughToRepaint(IntRect(), IntRect(), layerSize));
     // Going from empty to non-empty means we must re-record because it could be the first frame after construction or Clear.
     EXPECT_TRUE(interestRectChangedEnoughToRepaint(IntRect(), IntRect(0, 0, 1, 1), layerSize));
     // Going from non-empty to empty is not special-cased.
     EXPECT_FALSE(interestRectChangedEnoughToRepaint(IntRect(0, 0, 1, 1), IntRect(), layerSize));
 }
@@ skipping 46 matching lines @@
     EXPECT_FALSE(interestRectChangedEnoughToRepaint(previousInterestRect, newInterestRect, layerSize));
     newInterestRect.move(0, 512);
     EXPECT_FALSE(interestRectChangedEnoughToRepaint(previousInterestRect, newInterestRect, layerSize));
     newInterestRect.move(1, 0);
     EXPECT_TRUE(interestRectChangedEnoughToRepaint(previousInterestRect, newInterestRect, layerSize));
     newInterestRect.move(-1, 1);
     EXPECT_TRUE(interestRectChangedEnoughToRepaint(previousInterestRect, newInterestRect, layerSize));
 }
 
 } // namespace blink