Fix paint and rect mapping issues for stacked float under stacked inline

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
index 8d146dbd29eed715e0b69f1f10c081b945c08aea..00278f11430237c665b18b2e028d5b93172b08d2 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
@@ -3147,4 +3147,28 @@ TEST_P(PaintPropertyTreeBuilderTest, FloatUnderInline) {
   EXPECT_EQ(effect, localBorderBoxProperties->effect());
 }
 
+TEST_P(PaintPropertyTreeBuilderTest, StackedFloatUnderStackedInline) {
+  setBodyInnerHTML(
+      "<div style='position: absolute; top: 55px; left: 66px'>"
+      "  <span id='span'"
+      "      style='position: relative; top: 100px; left: 200px; opacity: 0.5'>"
+      "    <div id='target' style='float: left; position: relative; "
+      "        top: 11px; left: 22px; width: 33px; height: 44px'>"
+      "    </div>"
+      "  </span>"
+      "</div>");
+
+  LayoutObject* span = getLayoutObjectByElementId("span");
+  const auto* effect = span->paintProperties()->effect();
+  ASSERT_TRUE(effect);
+  EXPECT_EQ(0.5f, effect->opacity());
+
+  LayoutObject* target = getLayoutObjectByElementId("target");
+  const auto* localBorderBoxProperties =
+      target->paintProperties()->localBorderBoxProperties();
+  ASSERT_TRUE(localBorderBoxProperties);
+  EXPECT_EQ(LayoutPoint(288, 166), target->paintOffset());
+  EXPECT_EQ(effect, localBorderBoxProperties->effect());
+}
+
 }  // namespace blink