Only promote fixed position elements on low dpi without transform or opacity.

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

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
index f903b430f7e15d17007f653dd964302612b1b00c..22b69f679c0e5f21ec526f9ac6e97a7168158c83 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp
@@ -791,47 +791,6 @@ TEST_P(CompositedLayerMappingTest, InterestRectOfIframeWithContentBoxOffset) {
                                 ->graphicsLayerBackingForScrolling()));
 }
 
-TEST_P(CompositedLayerMappingTest, PromoteOpaqueFixedPosition) {
-  const bool preferCompositing =
-      document().frame()->settings()->preferCompositingToLCDTextEnabled();
-  document().frame()->settings()->setPreferCompositingToLCDTextEnabled(false);
-  ScopedCompositeFixedPositionForTest compositeFixedPosition(true);
-
-  setBodyInnerHTML(
-      "<div id='translucent' style='width: 20px; height: 20px; position: "
-      "fixed; top: 100px; left: 100px;'></div>"
-      "<div id='opaque' style='width: 20px; height: 20px; position: fixed; "
-      "top: 100px; left: 200px; background: white;'></div>"
-      "<div id='opaque-with-shadow' style='width: 20px; height: 20px; "
-      "position: fixed; top: 100px; left: 300px; background: white; "
-      "box-shadow: 10px 10px 5px #888888;'></div>"
-      "<div id='spacer' style='height: 2000px'></div>");
-
-  document().view()->updateAllLifecyclePhases();
-
-  // The translucent fixed box should not be promoted.
-  Element* element = document().getElementById("translucent");
-  PaintLayer* paintLayer =
-      toLayoutBoxModelObject(element->layoutObject())->layer();
-  EXPECT_EQ(NotComposited, paintLayer->compositingState());
-
-  // The opaque fixed box should be promoted and be opaque so that text will be
-  // drawn with subpixel anti-aliasing.
-  element = document().getElementById("opaque");
-  paintLayer = toLayoutBoxModelObject(element->layoutObject())->layer();
-  EXPECT_EQ(PaintsIntoOwnBacking, paintLayer->compositingState());
-  EXPECT_TRUE(paintLayer->graphicsLayerBacking()->contentsOpaque());
-
-  // The opaque fixed box with shadow should not be promoted because the layer
-  // will include the shadow which is not opaque.
-  element = document().getElementById("opaque-with-shadow");
-  paintLayer = toLayoutBoxModelObject(element->layoutObject())->layer();
-  EXPECT_EQ(NotComposited, paintLayer->compositingState());
-
-  document().frame()->settings()->setPreferCompositingToLCDTextEnabled(
-      preferCompositing);
-}
-
 TEST_P(CompositedLayerMappingTest,
        ScrollingContentsAndForegroundLayerPaintingPhase) {
   document().frame()->settings()->setPreferCompositingToLCDTextEnabled(true);