[scheduler] Use Finch to control background throttling.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 414 matching lines @@
       m_baseBackgroundColor(Color::white),
       m_backgroundColorOverride(Color::transparent),
       m_zoomFactorOverride(0),
       m_userGestureObserved(false),
       m_shouldDispatchFirstVisuallyNonEmptyLayout(false),
       m_shouldDispatchFirstLayoutAfterFinishedParsing(false),
       m_shouldDispatchFirstLayoutAfterFinishedLoading(false),
       m_displayMode(WebDisplayModeBrowser),
       m_elasticOverscroll(FloatSize()),
       m_mutator(nullptr),
-      m_scheduler(wrapUnique(Platform::current()
-                                 ->currentThread()
-                                 ->scheduler()
-                                 ->createWebViewScheduler(this)
-                                 .release())),
       m_lastFrameTimeMonotonic(0),
       m_overrideCompositorVisibility(false) {
   Page::PageClients pageClients;
   pageClients.chromeClient = m_chromeClientImpl.get();
   pageClients.contextMenuClient = &m_contextMenuClientImpl;
   pageClients.editorClient = &m_editorClientImpl;
   pageClients.spellCheckerClient = &m_spellCheckerClientImpl;
 
   m_page = Page::createOrdinary(pageClients);
   MediaKeysController::provideMediaKeysTo(*m_page, &m_mediaKeysClientImpl);
   provideSpeechRecognitionTo(
       *m_page, SpeechRecognitionClientProxy::create(
                    client ? client->speechRecognizer() : nullptr));
   provideContextFeaturesTo(*m_page, ContextFeaturesClientImpl::create());
   provideDatabaseClientTo(*m_page, DatabaseClientImpl::create());
 
   provideStorageQuotaClientTo(*m_page, StorageQuotaClientImpl::create());
   m_page->setValidationMessageClient(
       ValidationMessageClientImpl::create(*this));
   provideDedicatedWorkerMessagingProxyProviderTo(
       *m_page, DedicatedWorkerMessagingProxyProviderImpl::create());
   StorageNamespaceController::provideStorageNamespaceTo(*m_page,
                                                         &m_storageClientImpl);
 
+  m_devToolsEmulator = DevToolsEmulator::create(this);
+
+  m_scheduler =
+      Platform::current()->currentThread()->scheduler()->createWebViewScheduler(
+          this, settingsImpl());
+
   setVisibilityState(visibilityState, true);
 
   initializeLayerTreeView();
 
-  m_devToolsEmulator = DevToolsEmulator::create(this);
-
   allInstances().add(this);
 
   m_pageImportanceSignals.setObserver(client);
   m_resizeViewportAnchor = new ResizeViewportAnchor(*m_page);
 }
 
 WebViewImpl::~WebViewImpl() {
   DCHECK(!m_page);
 
   // Each highlight uses m_owningWebViewImpl->m_linkHighlightsTimeline
@@ skipping 3963 matching lines @@
   if (focusedFrame->localFrameRoot() != mainFrameImpl()->frame())
     return nullptr;
   return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const {
   return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink