Initial implementation of WorkletAnimation

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 623 matching lines @@
       document_timing_(*this),
       write_recursion_is_too_deep_(false),
       write_recursion_depth_(0),
       registration_context_(initializer.RegistrationContext(this)),
       element_data_cache_clear_timer_(
           TaskRunnerHelper::Get(TaskType::kUnspecedTimer, this),
           this,
           &Document::ElementDataCacheClearTimerFired),
       timeline_(DocumentTimeline::Create(this)),
       pending_animations_(new PendingAnimations(*this)),
+      worklet_animation_controller_(new WorkletAnimationController),

[haraken, 2017/09/08 01:11:23]

Don't you need to take some action when Document is ShutDown()?

For example, cancel all pending / running animations on the WorkletAnimation.

[smcgruer, 2017/09/11 18:19:00]

At the moment, I'm unsure. This was based on PendingAnimations
(https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/animation...),
which does not have any such logic that I'm aware of. I believe the destructors
of the garbage-collected Animations/WorkletAnimation classes are simply meant to
take care of it.

We should understand our own lifecycle better though. I will work on this with
majidvp@ and see if we can get a better answer for you.

       template_document_host_(nullptr),
       did_associate_form_controls_timer_(
           TaskRunnerHelper::Get(TaskType::kUnspecedLoading, this),
           this,
           &Document::DidAssociateFormControlsTimerFired),
       timers_(TaskRunnerHelper::Get(TaskType::kTimer, this)),
       has_viewport_units_(false),
       parser_sync_policy_(kAllowAsynchronousParsing),
       node_count_(0),
       would_load_reason_(WouldLoadReason::kInvalid),
@@ skipping 6346 matching lines @@
   visitor->Trace(custom_element_microtask_run_queue_);
   visitor->Trace(element_data_cache_);
   visitor->Trace(use_elements_needing_update_);
   visitor->Trace(timers_);
   visitor->Trace(template_document_);
   visitor->Trace(template_document_host_);
   visitor->Trace(user_action_elements_);
   visitor->Trace(svg_extensions_);
   visitor->Trace(timeline_);
   visitor->Trace(pending_animations_);
+  visitor->Trace(worklet_animation_controller_);
   visitor->Trace(context_document_);
   visitor->Trace(canvas_font_cache_);
   visitor->Trace(intersection_observer_controller_);
   visitor->Trace(snap_coordinator_);
   visitor->Trace(resize_observer_controller_);
   visitor->Trace(property_registry_);
   visitor->Trace(network_state_observer_);
   Supplementable<Document>::Trace(visitor);
   TreeScope::Trace(visitor);
   ContainerNode::Trace(visitor);
@@ skipping 48 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->Url().GetString().Utf8().data());
 }
 #endif