cc: Allow sending BeginMainFrame before draw or activation

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 <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),
       allow_antialiasing(true),
       throttle_frame_production(true),
       begin_impl_frame_scheduling_enabled(false),
       deadline_scheduling_enabled(true),
+      start_commit_before_draw_enabled(true),
+      start_commit_before_activate_enabled(false),
       using_synchronous_renderer_compositor(false),
       per_tile_painting_enabled(false),
       partial_swap_enabled(false),
       accelerated_animation_enabled(true),
       background_color_instead_of_checkerboard(false),
       show_overdraw_in_tracing(false),
       can_use_lcd_text(true),
       should_clear_root_render_pass(true),
       gpu_rasterization(false),
       scrollbar_animator(NoAnimator),
@@ skipping 27 matching lines @@
       strict_layer_property_change_checking(false),
       use_map_image(false),
       ignore_root_layer_flings(false),
       use_rgba_4444_textures(false),
       touch_hit_testing(true),
       texture_id_allocation_chunk_size(64) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 }  // namespace cc