cc: Invalidate eviction cache in cases where we remove/add tiles.

cc/resources/picture_layer_tiling_unittest.cc

 // Copyright 2012 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/resources/picture_layer_tiling.h"
 
 #include <limits>
 #include <set>
 
 #include "cc/base/math_util.h"
@@ skipping 1328 matching lines @@
       SMOOTHNESS_TAKES_PRIORITY,
       PictureLayerTiling::NOW_AND_REQUIRED_FOR_ACTIVATION);
   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) {
   gfx::Size layer_bounds(1099, 801);
   Initialize(gfx::Size(100, 100), 1.f, layer_bounds);
   VerifyTilesExactlyCoverRect(1.f, gfx::Rect(layer_bounds));
   VerifyTiles(1.f, gfx::Rect(layer_bounds), base::Bind(&TileExists, false));
 
   client_.set_tree(ACTIVE_TREE);
   tiling_->ComputeTilePriorityRects(
@@ skipping 807 matching lines @@
   EXPECT_EQ(active_tiling->TileAt(0, 0), recycle_tiling->TileAt(0, 0));
 
   // Reset the active tiling. The recycle tiles should be released too.
   active_tiling->Reset();
   EXPECT_FALSE(active_tiling->TileAt(0, 0));
   EXPECT_FALSE(recycle_tiling->TileAt(0, 0));
 }
 
 }  // namespace
 }  // namespace cc