cc: Get rid of LayerTreeHost::output_surface_lost_ state.

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 <stddef.h>
 
 #include <unordered_map>
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/animation/animation_host.h"
@@ skipping 107 matching lines @@
     params.settings = &layer_tree_settings_;
     params.task_graph_runner = &task_graph_runner_;
     params.animation_host =
         AnimationHost::CreateForTesting(ThreadInstance::MAIN);
 
     layer_tree_host_.reset(
         new FakeResourceTrackingLayerTreeHost(&fake_client_, &params));
     layer_tree_ = layer_tree_host_->GetLayerTree();
     layer_tree_host_->SetVisible(true);
     fake_client_.SetLayerTreeHost(layer_tree_host_.get());
-    // Force output surface creation for renderer capabilities.
-    layer_tree_host_->Composite(base::TimeTicks());
-    EXPECT_FALSE(layer_tree_host_->output_surface_lost());
   }
 
   LayerImpl* LayerImplForScrollAreaAndScrollbar(
       FakeLayerTreeHost* host,
       std::unique_ptr<Scrollbar> scrollbar,
       bool reverse_order,
       bool use_solid_color_scrollbar,
       int thumb_thickness,
       int track_start) {
     scoped_refptr<Layer> layer_tree_root = Layer::Create();
@@ skipping 947 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