cc: Add tiling raster tile iterator construction perftest.

cc/resources/picture_layer_tiling_perftest.cc

 // Copyright 2013 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 "cc/debug/lap_timer.h"
 #include "cc/resources/picture_layer_tiling.h"
 #include "cc/test/fake_picture_layer_tiling_client.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/perf/perf_test.h"
@@ skipping 94 matching lines @@
     } while (!timer_.HasTimeLimitExpired());
 
     perf_test::PrintResult("update_tile_priorities_scrolling",
                            "",
                            test_name,
                            timer_.LapsPerSecond(),
                            "runs/s",
                            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) {
     gfx::Size bounds(10000, 10000);
     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 {
       int count = num_tiles;
       for (PictureLayerTiling::TilingRasterTileIterator it(
                picture_layer_tiling_.get(), ACTIVE_TREE);
            it && count;

[reveman, 2014/07/16 22:09:03]

whatever we decide is the best approach for the eviction perf test, we should do
the same here.

[vmpstr, 2014/07/17 00:17:41]

Done.

            ++it) {
         --count;
       }
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
 
     perf_test::PrintResult("tiling_raster_tile_iterator",

[reveman, 2014/07/16 22:09:03]

this should be renamed to make it explicit that it also includes construction
cost now that we have separate test for that

[vmpstr, 2014/07/17 00:17:41]

Done.

                            "",
                            test_name,
                            timer_.LapsPerSecond(),
                            "runs/s",
                            true);
   }
 
  private:
   FakePictureLayerTilingClient picture_layer_tiling_client_;
   scoped_ptr<PictureLayerTiling> picture_layer_tiling_;
@@ skipping 25 matching lines @@
 
   transform.Rotate(10);
   RunUpdateTilePrioritiesStationaryTest("rotation", transform);
   RunUpdateTilePrioritiesScrollingTest("rotation", transform);
 
   transform.ApplyPerspectiveDepth(10);
   RunUpdateTilePrioritiesStationaryTest("perspective", transform);
   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));
   RunTilingRasterTileIteratorTest("64_100x100", 64, gfx::Rect(0, 0, 100, 100));
   RunTilingRasterTileIteratorTest("64_500x500", 64, gfx::Rect(0, 0, 500, 500));
 }
 
 }  // namespace
 
 }  // namespace cc