Update from https://crrev.com/320343

cc/trees/layer_tree_settings.cc

 // Copyright 2011 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/trees/layer_tree_settings.h"
 
 #include <GLES2/gl2.h>
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace cc {
 
 LayerTreeSettings::LayerTreeSettings()
     : impl_side_painting(false),
+      raster_enabled(true),
       throttle_frame_production(true),
       single_thread_proxy_scheduler(true),
       use_external_begin_frame_source(false),
       forward_begin_frames_to_children(false),
       main_frame_before_activation_enabled(false),
       using_synchronous_renderer_compositor(false),
       disable_hi_res_timer_tasks_on_battery(false),
       report_overscroll_only_for_scrollable_axes(false),
       per_tile_painting_enabled(false),
       accelerated_animation_enabled(true),
@@ skipping 42 matching lines @@
       scheduled_raster_task_limit(32),
       use_occlusion_for_tile_prioritization(false),
       record_full_layer(false),
       use_display_lists(false),
       verify_property_trees(false) {
 }
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 }  // namespace cc