cc: Add tiling raster tile iterator construction perftest.

cc/resources/picture_layer_tiling_perftest.cc

Index: cc/resources/picture_layer_tiling_perftest.cc
diff --git a/cc/resources/picture_layer_tiling_perftest.cc b/cc/resources/picture_layer_tiling_perftest.cc
index a610c1ea28e9a331aa9c9f0982362b0bf54dde61..9f4f274e62d91fbf63368cdcbe15fc126cf7fc26 100644
--- a/cc/resources/picture_layer_tiling_perftest.cc
+++ b/cc/resources/picture_layer_tiling_perftest.cc
@@ -112,6 +112,29 @@ class PictureLayerTilingPerfTest : public testing::Test {
                            true);
   }
 
+  void RunTilingRasterTileIteratorConstructionTest(const std::string& test_name,
+                                                   const gfx::Rect& viewport) {
+    gfx::Size bounds(viewport.size());
+    picture_layer_tiling_ =
+        PictureLayerTiling::Create(1, bounds, &picture_layer_tiling_client_);
+    picture_layer_tiling_->UpdateTilePriorities(
+        ACTIVE_TREE, viewport, 1.0f, 1.0, NULL, NULL, gfx::Transform());
+
+    timer_.Reset();
+    do {
+      PictureLayerTiling::TilingRasterTileIterator it(
+          picture_layer_tiling_.get(), ACTIVE_TREE);
+      timer_.NextLap();
+    } while (!timer_.HasTimeLimitExpired());
+
+    perf_test::PrintResult("tiling_raster_tile_iterator_construction",
+                           "",
+                           test_name,
+                           timer_.LapsPerSecond(),
+                           "runs/s",
+                           true);
+  }
+
   void RunTilingRasterTileIteratorTest(const std::string& test_name,
                                        int num_tiles,
                                        const gfx::Rect& viewport) {
@@ -179,6 +202,17 @@ TEST_F(PictureLayerTilingPerfTest, UpdateTilePriorities) {
   RunUpdateTilePrioritiesScrollingTest("perspective", transform);
 }
 
+TEST_F(PictureLayerTilingPerfTest, TilingRasterTileIteratorConstruction) {
+  RunTilingRasterTileIteratorConstructionTest("0_0_100x100",
+                                              gfx::Rect(0, 0, 100, 100));
+  RunTilingRasterTileIteratorConstructionTest("50_0_100x100",
+                                              gfx::Rect(50, 0, 100, 100));
+  RunTilingRasterTileIteratorConstructionTest("100_0_100x100",
+                                              gfx::Rect(100, 0, 100, 100));
+  RunTilingRasterTileIteratorConstructionTest("150_0_100x100",
+                                              gfx::Rect(150, 0, 100, 100));
+}
+
 TEST_F(PictureLayerTilingPerfTest, TilingRasterTileIterator) {
   RunTilingRasterTileIteratorTest("32_100x100", 32, gfx::Rect(0, 0, 100, 100));
   RunTilingRasterTileIteratorTest("32_500x500", 32, gfx::Rect(0, 0, 500, 500));