Raster display item lists via a visual rect RTree.

cc/layers/picture_layer_impl_unittest.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/layers/picture_layer_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <limits>
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   void AssertNoTilesRequired(PictureLayerTiling* tiling) {
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     for (size_t i = 0; i < tiles.size(); ++i)
       EXPECT_FALSE(tiles[i]->required_for_activation()) << "i: " << i;
     EXPECT_GT(tiles.size(), 0u);
   }
 
   void SetInitialDeviceScaleFactor(float device_scale_factor) {
     // Device scale factor is a per-tree property. However, tests can't directly
     // set the pending tree's device scale factor before the pending tree is
-    // created, and setting it after SetupPendingTreeis too late, since
+    // created, and setting it after SetupPendingTree is too late, since
     // draw properties will already have been updated on the tree. To handle
     // this, we initially set only the active tree's device scale factor, and we
     // copy this over to the pending tree inside SetupPendingTree.
     host_impl()->active_tree()->SetDeviceScaleFactor(device_scale_factor);
   }
 
   void TestQuadsForSolidColor(bool test_for_solid);
 };
 
 class NoLowResPictureLayerImplTest : public PictureLayerImplTest {
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   // New low res tiling.
   EXPECT_TRUE(tilings->tiling_at(2)->may_contain_low_resolution_tiles());
 
   // This tiling will be high res now, it won't contain low res content since it
   // was all destroyed.
   EXPECT_FALSE(tilings->tiling_at(1)->may_contain_low_resolution_tiles());
 }
 
 }  // namespace
 }  // namespace cc