Invalidate touchEventTargetRects in ScrollingCoordinator when toggling touch emulation.

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 612 matching lines @@
     EXPECT_TRUE(static_cast<LayoutBoxModelObject*>(fixedPos->layoutObject())->layer()->hasCompositedLayerMapping());
     EXPECT_FALSE(scrollLayer->shouldScrollOnMainThread());
 
     fixedPos->setInlineStyleProperty(CSSPropertyTransform, CSSValueNone);
     forceFullCompositingUpdate();
 
     EXPECT_FALSE(static_cast<LayoutBoxModelObject*>(fixedPos->layoutObject())->layer()->hasCompositedLayerMapping());
     EXPECT_TRUE(scrollLayer->shouldScrollOnMainThread());
 }
 
+TEST_F(ScrollingCoordinatorTest, TouchEventTargetRectsWithEmulatedTouch)
+{
+    RuntimeEnabledFeatures::setTouchEnabled(false);
+
+    registerMockedHttpURLLoad("touch-event-target-rects.html");
+    navigateTo(m_baseURL + "touch-event-target-rects.html");
+    forceFullCompositingUpdate();
+    ScrollingCoordinator* coordinator = webViewImpl()->page()->scrollingCoordinator();
+
+    EXPECT_EQ(0u, coordinator->touchEventTargetLayersCountForTest());
+    webViewImpl()->setTouchEventEmulationEnabled(true);
+    EXPECT_EQ(1u, coordinator->touchEventTargetLayersCountForTest());
+    webViewImpl()->setTouchEventEmulationEnabled(false);
+    EXPECT_EQ(0u, coordinator->touchEventTargetLayersCountForTest());
+}
+
 } // namespace blink