[scheduler] Use Finch to control background throttling.

content/public/common/web_preferences.cc

 // Copyright 2014 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 "content/public/common/web_preferences.h"
 
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "third_party/WebKit/public/web/WebSettings.h"
@@ skipping 163 matching lines @@
       use_solid_color_scrollbars(false),
       navigate_on_drag_drop(true),
       v8_cache_options(V8_CACHE_OPTIONS_DEFAULT),
       inert_visual_viewport(false),
       record_whole_document(false),
       cookie_enabled(true),
       pepper_accelerated_video_decode_enabled(false),
       animation_policy(IMAGE_ANIMATION_POLICY_ALLOWED),
       user_gesture_required_for_presentation(true),
       text_track_margin_percentage(0.0f),
+      expensive_background_throttling_cpu_budget(-1.0f),

[Sami, 2016/11/04 16:50:28]

Agreed offline that we'll try to find a way to keep the scheduler in charge of
defaults while letting these settings override things only when needed.

[altimin, 2016/11/07 15:19:49]

Done.

+      expensive_background_throttling_initial_budget(1.0f),
+      expensive_background_throttling_max_budget(1.0f),
+      expensive_background_throttling_max_delay(-1.0f),
 #if defined(OS_ANDROID)
       text_autosizing_enabled(true),
       font_scale_factor(1.0f),
       device_scale_adjustment(1.0f),
       force_enable_zoom(false),
       fullscreen_supported(true),
       double_tap_to_zoom_enabled(true),
       user_gesture_required_for_media_playback(true),
       support_deprecated_target_density_dpi(false),
       use_legacy_background_size_shorthand_behavior(false),
@@ skipping 15 matching lines @@
 #if defined(OS_ANDROID)
       default_minimum_page_scale_factor(0.25f),
       default_maximum_page_scale_factor(5.f),
 #elif defined(OS_MACOSX)
       default_minimum_page_scale_factor(1.f),
       default_maximum_page_scale_factor(3.f),
 #else
       default_minimum_page_scale_factor(1.f),
       default_maximum_page_scale_factor(4.f),
 #endif
-      hide_download_ui(false)
-{
+      hide_download_ui(false) {
   standard_font_family_map[kCommonScript] =
       base::ASCIIToUTF16("Times New Roman");
   fixed_font_family_map[kCommonScript] = base::ASCIIToUTF16("Courier New");
   serif_font_family_map[kCommonScript] = base::ASCIIToUTF16("Times New Roman");
   sans_serif_font_family_map[kCommonScript] = base::ASCIIToUTF16("Arial");
   cursive_font_family_map[kCommonScript] = base::ASCIIToUTF16("Script");
   fantasy_font_family_map[kCommonScript] = base::ASCIIToUTF16("Impact");
   pictograph_font_family_map[kCommonScript] =
       base::ASCIIToUTF16("Times New Roman");
 }
 
 WebPreferences::WebPreferences(const WebPreferences& other) = default;
 
 WebPreferences::~WebPreferences() {
 }
 
 }  // namespace content