[WIP] cc: Use reverse spiral iterator in tiling eviction.

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 43ec6fef80356ba0aa806b4ce4067459a99aee2e..294c1ac4547d8609a46abe0f42796824ece91140 100644
--- a/cc/resources/picture_layer_tiling_perftest.cc
+++ b/cc/resources/picture_layer_tiling_perftest.cc
@@ -193,9 +193,8 @@ class PictureLayerTilingPerfTest : public testing::Test {
     int priority_count = 0;
     do {
       PictureLayerTiling::TilingEvictionTileIterator it(
-          picture_layer_tiling_.get(),
-          priorities[priority_count],
-          PictureLayerTiling::NOW);
+          picture_layer_tiling_.get(), priorities[priority_count],
+          PictureLayerTiling::NOW, false);
       priority_count = (priority_count + 1) % arraysize(priorities);
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
@@ -238,9 +237,8 @@ class PictureLayerTilingPerfTest : public testing::Test {
     do {
       int count = num_tiles;
       PictureLayerTiling::TilingEvictionTileIterator it(
-          picture_layer_tiling_.get(),
-          priorities[priority_count],
-          PictureLayerTiling::EVENTUALLY);
+          picture_layer_tiling_.get(), priorities[priority_count],
+          PictureLayerTiling::EVENTUALLY, false);
       while (count--) {
         ASSERT_TRUE(it) << "count: " << count;
         ASSERT_TRUE(*it != NULL) << "count: " << count;