cc: Make low res tilings off by default in LayerTreeSettings.

cc/resources/tile_manager_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/resources/eviction_tile_priority_queue.h"
 #include "cc/resources/raster_tile_priority_queue.h"
 #include "cc/resources/tile.h"
 #include "cc/resources/tile_priority.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
@@ skipping 464 matching lines @@
   ReleaseTiles(&active_tree_tiles);
   ReleaseTiles(&pending_tree_tiles);
 }
 
 // If true, the max tile limit should be applied as bytes; if false,
 // as num_resources_limit.
 INSTANTIATE_TEST_CASE_P(TileManagerTests,
                         TileManagerTest,
                         ::testing::Values(true, false));
 
+class LowResTilingsSettings : public ImplSidePaintingSettings {
+ public:
+  LowResTilingsSettings() { create_low_res_tiling = true; }
+};
+
 class TileManagerTilePriorityQueueTest : public testing::Test {
  public:
   TileManagerTilePriorityQueueTest()
       : memory_limit_policy_(ALLOW_ANYTHING),
         max_tiles_(10000),
         ready_to_activate_(false),
         id_(7),
         proxy_(base::MessageLoopProxy::current()),
-        host_impl_(ImplSidePaintingSettings(),
-                   &proxy_,
-                   &shared_bitmap_manager_) {}
+        host_impl_(LowResTilingsSettings(), &proxy_, &shared_bitmap_manager_) {}
 
   void SetTreePriority(TreePriority tree_priority) {
     GlobalStateThatImpactsTilePriority state;
     gfx::Size tile_size(256, 256);
 
     state.soft_memory_limit_in_bytes = 100 * 1000 * 1000;
     state.num_resources_limit = max_tiles_;
     state.hard_memory_limit_in_bytes = state.soft_memory_limit_in_bytes * 2;
     state.memory_limit_policy = memory_limit_policy_;
     state.tree_priority = tree_priority;
@@ skipping 707 matching lines @@
     all_tiles.insert(queue.Top());
     ++tile_count;
     queue.Pop();
   }
   EXPECT_EQ(tile_count, all_tiles.size());
   EXPECT_EQ(17u, tile_count);
 }
 
 }  // namespace
 }  // namespace cc