cc: Remove tiles from recycle tree that were deleted on active.

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 1930 matching lines @@
 
   tiling->Reset();
   for (std::vector<scoped_refptr<Tile> >::const_iterator it = tiles.begin();
        it != tiles.end();
        ++it) {
     EXPECT_EQ(TilePriority(), (*it)->priority(ACTIVE_TREE));
   }
   tiles.clear();
 }
 
+TEST(PictureLayerTilingTest, RecycledTilesCleared) {

[enne (OOO), 2014/08/22 23:01:05]

For forgetful future ennes, could you leave a comment about what this test is
attempt to test?

[vmpstr, 2014/08/25 18:41:00]

Done.

+  FakePictureLayerTilingClient client;
+  scoped_ptr<TestablePictureLayerTiling> tiling;
+
+  client.SetTileSize(gfx::Size(100, 100));
+  client.set_tree(ACTIVE_TREE);
+  client.set_max_tiles_for_interest_area(10);
+  tiling = TestablePictureLayerTiling::Create(1.0f,  // contents_scale
+                                              gfx::Size(10000, 10000),
+                                              &client);
+  tiling->UpdateTilePriorities(ACTIVE_TREE,
+                               gfx::Rect(0, 0, 100, 100),
+                               1.0f,
+                               1.0f,
+                               NULL,               // occlusion tracker
+                               NULL,               // render target
+                               gfx::Transform());  // draw transform
+
+  FakePictureLayerTilingClient second_client;
+  second_client.SetTileSize(gfx::Size(100, 100));
+  second_client.set_tree(PENDING_TREE);
+  second_client.set_twin_tiling(tiling.get());
+  second_client.set_max_tiles_for_interest_area(10);
+
+  scoped_ptr<TestablePictureLayerTiling> second_tiling;
+  second_tiling = TestablePictureLayerTiling::Create(1.0f,  // contents_scale
+                                                     gfx::Size(10000, 10000),
+                                                     &second_client);
+  second_tiling->UpdateTilePriorities(ACTIVE_TREE,
+                                      gfx::Rect(0, 0, 100, 100),
+                                      1.0f,
+                                      1.0f,
+                                      NULL,               // occlusion tracker
+                                      NULL,               // render target
+                                      gfx::Transform());  // draw transform
+
+  ASSERT_TRUE(tiling->TileAt(0, 0));
+  ASSERT_EQ(tiling->TileAt(0, 0), second_tiling->TileAt(0, 0));
+
+  client.set_twin_tiling(NULL);
+  client.set_recycled_twin_tiling(second_tiling.get());
+  second_client.set_twin_tiling(NULL);
+  tiling->UpdateTilePriorities(ACTIVE_TREE,
+                               gfx::Rect(9000, 9000, 100, 100),
+                               1.0f,
+                               2.0,
+                               NULL,               // occlusion tracker
+                               NULL,               // render target
+                               gfx::Transform());  // draw transform
+  EXPECT_FALSE(tiling->TileAt(0, 0));
+  tiling->UpdateTilePriorities(ACTIVE_TREE,
+                               gfx::Rect(0, 0, 100, 100),
+                               1.0f,
+                               3.0,
+                               NULL,               // occlusion tracker
+                               NULL,               // render target
+                               gfx::Transform());  // draw transform
+  EXPECT_TRUE(tiling->TileAt(0, 0));
+  EXPECT_FALSE(second_tiling->TileAt(0, 0));
+}
+
 }  // namespace
 }  // namespace cc