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

cc/resources/picture_layer_tiling_unittest.cc

Index: cc/resources/picture_layer_tiling_unittest.cc
diff --git a/cc/resources/picture_layer_tiling_unittest.cc b/cc/resources/picture_layer_tiling_unittest.cc
index 786f943e16727ea452c7a4ded693813911556bf6..e2531d453bdbd32732a1a7bd8da20791ed02dd4a 100644
--- a/cc/resources/picture_layer_tiling_unittest.cc
+++ b/cc/resources/picture_layer_tiling_unittest.cc
@@ -65,9 +65,6 @@ class TestablePictureLayerTiling : public PictureLayerTiling {
   }
 
   gfx::Rect live_tiles_rect() const { return live_tiles_rect_; }
-  bool eviction_tiles_cache_valid() const {
-    return eviction_tiles_cache_valid_;
-  }
 
   using PictureLayerTiling::ComputeSkewport;
   using PictureLayerTiling::RemoveTileAt;
@@ -1286,7 +1283,7 @@ TEST(PictureLayerTilingTest, TilingEvictionTileIteratorStaticViewport) {
   std::vector<Tile*> all_tiles = tiling->AllTilesForTesting();
 
   PictureLayerTiling::TilingEvictionTileIterator it(
-      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::NOW);
+      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::NOW, false);
 
   // Tiles don't have resources to evict.
   EXPECT_FALSE(it);
@@ -1301,7 +1298,8 @@ TEST(PictureLayerTilingTest, TilingEvictionTileIteratorStaticViewport) {
   std::set<Tile*> eviction_tiles;
 
   it = PictureLayerTiling::TilingEvictionTileIterator(
-      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::EVENTUALLY);
+      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::EVENTUALLY,
+      false);
   EXPECT_TRUE(it);
   for (; it; ++it) {
     Tile* tile = *it;
@@ -1313,7 +1311,7 @@ TEST(PictureLayerTilingTest, TilingEvictionTileIteratorStaticViewport) {
   }
 
   it = PictureLayerTiling::TilingEvictionTileIterator(
-      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::SOON);
+      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::SOON, false);
   EXPECT_TRUE(it);
   for (; it; ++it) {
     Tile* tile = *it;
@@ -1324,7 +1322,7 @@ TEST(PictureLayerTilingTest, TilingEvictionTileIteratorStaticViewport) {
   }
 
   it = PictureLayerTiling::TilingEvictionTileIterator(
-      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::NOW);
+      tiling.get(), SMOOTHNESS_TAKES_PRIORITY, PictureLayerTiling::NOW, false);
   EXPECT_TRUE(it);
   for (; it; ++it) {
     Tile* tile = *it;
@@ -1335,24 +1333,12 @@ TEST(PictureLayerTilingTest, TilingEvictionTileIteratorStaticViewport) {
   }
 
   it = PictureLayerTiling::TilingEvictionTileIterator(
-      tiling.get(),
-      SMOOTHNESS_TAKES_PRIORITY,
-      PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION);
+      tiling.get(), SMOOTHNESS_TAKES_PRIORITY,
+      PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION, false);
   EXPECT_FALSE(it);
 
   EXPECT_GT(all_tiles_set.size(), 0u);
   EXPECT_EQ(all_tiles_set, eviction_tiles);
-
-  EXPECT_TRUE(tiling->eviction_tiles_cache_valid());
-  tiling->RemoveTileAt(0, 0, nullptr);
-  EXPECT_FALSE(tiling->eviction_tiles_cache_valid());
-
-  it = PictureLayerTiling::TilingEvictionTileIterator(
-      tiling.get(), SMOOTHNESS_TAKES_PRIORITY,
-      PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION);
-  EXPECT_TRUE(tiling->eviction_tiles_cache_valid());
-  tiling->Reset();
-  EXPECT_FALSE(tiling->eviction_tiles_cache_valid());
 }
 
 TEST_F(PictureLayerTilingIteratorTest, TilesExist) {