Include transform origin in the transform tree.

Source/platform/graphics/paint/DisplayItemPropertyTreeBuilderTest.cpp

 // Copyright 2015 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 "config.h"
 #include "platform/graphics/paint/DisplayItemPropertyTreeBuilder.h"
 
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "platform/graphics/paint/DisplayItemClipTree.h"
@@ skipping 397 matching lines @@
 
     // There should be three range records, the middle one affected by the
     // scroll. Note that the translation due to scroll is the negative of the
     // scroll offset.
     EXPECT_THAT(rangeRecordsAsStdVector(), ElementsAre(
         AllOf(hasRange(0, 1), hasTransformNode(0), hasOffset(FloatSize(0, 0))),
         AllOf(hasRange(2, 3), hasTransformNode(0), hasOffset(FloatSize(90, -400))),
         AllOf(hasRange(4, 5), hasTransformNode(0), hasOffset(FloatSize(0, 0)))));
 }
 
+TEST_F(DisplayItemPropertyTreeBuilderTest, TransformTreeIncludesTransformOrigin)
+{
+    FloatPoint3D transformOrigin(1, 2, 3);
+    TransformationMatrix matrix;
+    matrix.scale3d(2, 2, 2);
+
+    auto transformClient = processBeginTransform3D(matrix, transformOrigin);
+    processDummyDisplayItem();
+    processEndTransform3D(transformClient);
+    finishPropertyTrees();
+
+    // There should be two transform nodes.
+    ASSERT_EQ(2u, transformTree().nodeCount());
+    EXPECT_TRUE(transformTree().nodeAt(0).isRoot());
+
+    // And the non-root node should have both the matrix and the origin,
+    // separately.
+    const auto& transformNode = transformTree().nodeAt(1);
+    EXPECT_EQ(0u, transformNode.parentNodeIndex);
+    EXPECT_EQ(TransformationMatrix::toSkMatrix44(matrix), transformNode.matrix);
+    EXPECT_EQ(transformOrigin, transformNode.transformOrigin);
+}
+
 } // namespace
 } // namespace blink