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

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "base/test/test_simple_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/layers/layer.h"
 #include "cc/test/fake_output_surface.h"
@@ skipping 500 matching lines @@
             Pointee(drawsRectangle(FloatRect(0, 0, 300, 200), Color::black)));
         gfx::RectF mappedRect(0, 0, 300, 200);
         layer->screen_space_transform().TransformRect(&mappedRect);
         EXPECT_EQ(gfx::RectF(0, 0, 600, 400), mappedRect);
     }
     EXPECT_NE(
         contentLayerAt(0)->transform_tree_index(),
         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