Perform BSP polygon splitting and orientation selection in a single step.

cc/quads/draw_polygon_unittest.cc

Index: cc/quads/draw_polygon_unittest.cc
diff --git a/cc/quads/draw_polygon_unittest.cc b/cc/quads/draw_polygon_unittest.cc
index 884777fc2244e8cc3a1df4e308347100d90f4c08..c145546b17cd883f5d5a8ae2417d448dd551621f 100644
--- a/cc/quads/draw_polygon_unittest.cc
+++ b/cc/quads/draw_polygon_unittest.cc
@@ -298,13 +298,12 @@ TEST(DrawPolygonSplitTest, BasicSplit) {
   CREATE_NEW_DRAW_POLYGON(
       polygon_b, vertices_b, gfx::Vector3dF(-1.0f, 0.0f, 0.0f), 1);
 
-  EXPECT_EQ(BSP_SPLIT, DrawPolygon::SideCompare(polygon_b, polygon_a));
-
   std::unique_ptr<DrawPolygon> front_polygon;
   std::unique_ptr<DrawPolygon> back_polygon;
-  polygon_b.Split(polygon_a, &front_polygon, &back_polygon);
-  EXPECT_EQ(BSP_FRONT, DrawPolygon::SideCompare(*front_polygon, polygon_a));
-  EXPECT_EQ(BSP_BACK, DrawPolygon::SideCompare(*back_polygon, polygon_a));
+  EXPECT_FALSE(
+      polygon_a.SplitPolygon(polygon_b, &front_polygon, &back_polygon));
+  EXPECT_TRUE(front_polygon != nullptr);
+  EXPECT_TRUE(back_polygon != nullptr);
 
   std::vector<gfx::Point3F> test_points_a;
   test_points_a.push_back(gfx::Point3F(5.0f, 0.0f, 0.0f));
@@ -342,16 +341,12 @@ TEST(DrawPolygonSplitTest, AngledSplit) {
   CREATE_NEW_DRAW_POLYGON(
       polygon_b, vertices_b, gfx::Vector3dF(0.707107f, 0.0f, -0.707107f), 1);
 
-  EXPECT_EQ(BSP_SPLIT, DrawPolygon::SideCompare(polygon_a, polygon_b));
-
   std::unique_ptr<DrawPolygon> front_polygon;
   std::unique_ptr<DrawPolygon> back_polygon;
-  polygon_a.Split(polygon_b, &front_polygon, &back_polygon);
-  EXPECT_EQ(BSP_FRONT, DrawPolygon::SideCompare(*front_polygon, polygon_b));
-  EXPECT_EQ(BSP_BACK, DrawPolygon::SideCompare(*back_polygon, polygon_b));
-
-  EXPECT_EQ(3u, front_polygon->points().size());
-  EXPECT_EQ(5u, back_polygon->points().size());
+  EXPECT_FALSE(
+      polygon_b.SplitPolygon(polygon_a, &front_polygon, &back_polygon));
+  EXPECT_TRUE(front_polygon != nullptr);
+  EXPECT_TRUE(back_polygon != nullptr);
 
   std::vector<gfx::Point3F> test_points_a;
   test_points_a.push_back(gfx::Point3F(10.0f, 0.0f, 9.0f));