cc: one copy is default as well as final fallback.

cc/layers/scrollbar_layer_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 "base/containers/hash_tables.h"
 #include "base/thread_task_runner_handle.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/painted_scrollbar_layer.h"
 #include "cc/layers/painted_scrollbar_layer_impl.h"
@@ skipping 103 matching lines @@
   int next_id_;
   int total_ui_resource_created_;
   int total_ui_resource_deleted_;
 };
 
 class ScrollbarLayerTest : public testing::Test {
  public:
   ScrollbarLayerTest() : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {
     layer_tree_settings_.single_thread_proxy_scheduler = false;
     layer_tree_settings_.use_zero_copy = true;
-    layer_tree_settings_.use_one_copy = false;
 
     LayerTreeHost::InitParams params;
     params.client = &fake_client_;
     params.settings = &layer_tree_settings_;
     params.task_graph_runner = &task_graph_runner_;
 
     layer_tree_host_.reset(
         new FakeResourceTrackingLayerTreeHost(&fake_client_, &params));
     fake_client_.SetLayerTreeHost(layer_tree_host_.get());
     // Force output surface creation for renderer capabilities.
@@ skipping 890 matching lines @@
   TestScale(gfx::Rect(1240, 0, 15, 1333), 2.7754839f);
   TestScale(gfx::Rect(1240, 0, 15, 677), 2.46677136f);
 
   // Horizontal Scrollbars.
   TestScale(gfx::Rect(0, 1240, 1333, 15), 2.7754839f);
   TestScale(gfx::Rect(0, 1240, 677, 15), 2.46677136f);
 }
 
 }  // namespace
 }  // namespace cc