Record box shadow as main thread scrolling reasons

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 1019 matching lines @@
   ASSERT_FALSE(
       webScrollLayer->mainThreadScrollingReasons() &
       MainThreadScrollingReason::kHasNonLayerViewportConstrainedObjects);
 }
 
 class StyleRelatedMainThreadScrollingReasonTest
     : public ScrollingCoordinatorTest {
   static const uint32_t m_LCDTextRelatedReasons =
       MainThreadScrollingReason::kHasOpacityAndLCDText |
       MainThreadScrollingReason::kHasTransformAndLCDText |
-      MainThreadScrollingReason::kBackgroundNotOpaqueInRectAndLCDText;
+      MainThreadScrollingReason::kBackgroundNotOpaqueInRectAndLCDText |
+      MainThreadScrollingReason::kHasBoxShadowAndLCDText |
+      MainThreadScrollingReason::kHasTranslucentBorderAndLCDText;
+  static const uint32_t m_OpaqueScrollersRelatedReasons =
+      MainThreadScrollingReason::kHasTranslucentBorderAndLCDText;
 
  protected:
   StyleRelatedMainThreadScrollingReasonTest() {
     registerMockedHttpURLLoad("two_scrollable_area.html");
     navigateTo(m_baseURL + "two_scrollable_area.html");
   }
   void testStyle(const std::string& target, const uint32_t reason) {
     webViewImpl()->settings()->setPreferCompositingToLCDTextEnabled(false);
     Document* document = frame()->document();
     Element* container = document->getElementById("scroller1");
@@ skipping 31 matching lines @@
     forceFullCompositingUpdate();
 
     ASSERT_TRUE(frameView->mainThreadScrollingReasons() & reason);
 
     if ((reason & m_LCDTextRelatedReasons) &&
         !(reason & ~m_LCDTextRelatedReasons)) {
       webViewImpl()->settings()->setPreferCompositingToLCDTextEnabled(true);
       forceFullCompositingUpdate();
       ASSERT_FALSE(frameView->mainThreadScrollingReasons());
     }
+    if ((reason & m_OpaqueScrollersRelatedReasons) &&
+        !(reason & ~m_OpaqueScrollersRelatedReasons)) {
+      RuntimeEnabledFeatures::setCompositeOpaqueScrollersEnabled(true);
+      forceFullCompositingUpdate();
+      ASSERT_FALSE(frameView->mainThreadScrollingReasons());
+    }
   }
 };
 
 TEST_F(StyleRelatedMainThreadScrollingReasonTest, TransparentTest) {
   testStyle("transparent", MainThreadScrollingReason::kHasOpacityAndLCDText);
 }
 
 TEST_F(StyleRelatedMainThreadScrollingReasonTest, TransformTest) {
   testStyle("transform", MainThreadScrollingReason::kHasTransformAndLCDText);
 }
@@ skipping 45 matching lines @@
   forceFullCompositingUpdate();
   ASSERT_FALSE(frameView->mainThreadScrollingReasons() & reason);
 }
 
 TEST_F(StyleRelatedMainThreadScrollingReasonTest, LCDTextEnabledTest) {
   testStyle("transparent border-radius",
             MainThreadScrollingReason::kHasOpacityAndLCDText |
                 MainThreadScrollingReason::kHasBorderRadius);
 }
 
+TEST_F(StyleRelatedMainThreadScrollingReasonTest, BoxShadowTest) {
+  testStyle("box-shadow", MainThreadScrollingReason::kHasBoxShadowAndLCDText);
+}
+
+TEST_F(StyleRelatedMainThreadScrollingReasonTest, TranslucentBorderTest) {
+  RuntimeEnabledFeatures::setCompositeOpaqueScrollersEnabled(false);
+  testStyle("translucent-border",
+            MainThreadScrollingReason::kHasTranslucentBorderAndLCDText);
+}
+
+TEST_F(StyleRelatedMainThreadScrollingReasonTest, OpaqueScrollersEnabledTest) {
+  testStyle("translucent-border border-radius",
+            MainThreadScrollingReason::kHasOpacityAndLCDText |
+                MainThreadScrollingReason::kHasBorderRadius);
+}
+
 }  // namespace blink