Support compositing for active animations in SPv2.

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 c5b5f979fe69e30528d669d964492e8869bcf052..45a7295919d912179260df3d032cf221826de853 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
@@ -378,6 +378,25 @@ TEST_P(PaintPropertyTreeBuilderTest, Transform) {
       transform->layoutObject()->paintProperties()->transform()->matrix());
 }
 
+TEST_P(PaintPropertyTreeBuilderTest,
+       TransformNodeWithActiveAnimationHasDirectCompositingReason) {
+  setBodyInnerHTML(
+      "<style>"
+      "@keyframes test {"
+      "  0% { transform: translate(1em, 1em) } "
+      "  100% { transform: translate(2em, 2em) } "
+      "} "
+      "</style>"
+      "<div id='transform' "
+      "    style='animation-name: test; animation-duration: 1s'>"
+      "</div>");
+
+  Element* transform = document().getElementById("transform");
+  const ObjectPaintProperties* transformProperties =
+      transform->layoutObject()->paintProperties();
+  EXPECT_TRUE(transformProperties->transform()->hasDirectCompositingReasons());
+}
+
 TEST_P(PaintPropertyTreeBuilderTest, WillChangeTransform) {
   setBodyInnerHTML(
       "<style> body { margin: 0 } </style>"