[SPv2] Add unit test for foreign layers in layer list path.

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp

Index: third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp
index 457411c1749dff58aee7c3132538a900ec05b1a6..b995dcb3a70a39a409627e70682cf2e6a9e53d87 100644
--- a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositorTest.cpp
@@ -518,6 +518,20 @@ TEST_F(PaintArtifactCompositorTestWithPropertyTrees, TransformCombining)
         contentLayerAt(1)->transform_tree_index());
 }
 
+TEST_F(PaintArtifactCompositorTestWithPropertyTrees, ForeignLayerPassesThrough)

[pdr., 2016/07/06 23:23:23]

WDYT about extracting this out so PaintArtifactCompositorTestWithPropertyTrees
and PaintArtifactCompositorTest can share the same test?

LGTM regardless (above question is out of scope)

[jbroman, 2016/07/07 00:18:45]

It's rough, because this one isn't that long, and nearly all of them have
expectation differences interspersed. I'd kinda prefer to just leave this as-is;
makes it easier to remove the non-layer-list path when we're ready.

+{
+    scoped_refptr<cc::Layer> layer = cc::Layer::Create();
+
+    TestPaintArtifact artifact;
+    artifact.chunk(PaintChunkProperties())
+        .foreignLayer(FloatPoint(50, 100), IntSize(400, 300), layer);
+    update(artifact.build());
+
+    ASSERT_EQ(1u, contentLayerCount());
+    EXPECT_EQ(layer, contentLayerAt(0));
+    EXPECT_EQ(gfx::Size(400, 300), layer->bounds());
+    EXPECT_EQ(translation(50, 100), layer->screen_space_transform());
+}
 
 } // namespace
 } // namespace blink