Set a direct compositing reason for 3D transform & will-change property tree nodes

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 bd9a0b02a5482e7e10b465f4cb14ae36c4504171..eaef97ecd021bffe722c21ec4771073c43151df4 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp
@@ -334,7 +334,12 @@ TEST_P(PaintPropertyTreeBuilderTest, Perspective) {
 }
 
 TEST_P(PaintPropertyTreeBuilderTest, Transform) {
-  loadTestData("transform.html");
+  setBodyInnerHTML(
+      "<style> body { margin: 0 } </style>"

[chrishtr, 2016/12/13 23:35:35]

I inlined this for imrpoved clarity and to be like most of the tests
in this file. If you agree, can change the rest o the loadTestData()
instances in another patch.

+      "<div id='transform' style='margin-left: 50px; margin-top: 100px;"
+      "    width: 400px; height: 300px;"
+      "    transform: translate3D(123px, 456px, 789px)'>"
+      "</div>");
 
   Element* transform = document().getElementById("transform");
   const ObjectPaintProperties* transformProperties =
@@ -349,6 +354,10 @@ TEST_P(PaintPropertyTreeBuilderTest, Transform) {
             transformProperties->paintOffsetTranslation()->matrix());
   EXPECT_EQ(frameScrollTranslation(),
             transformProperties->paintOffsetTranslation()->parent());
+
+  EXPECT_TRUE(transformProperties->transform()->hasDirectCompositingReasons());
+  EXPECT_FALSE(frameScrollTranslation()->hasDirectCompositingReasons());
+
   CHECK_EXACT_VISUAL_RECT(LayoutRect(173, 556, 400, 300),
                           transform->layoutObject(),
                           document().view()->layoutView());