scheduler: Move the Blink scheduler into Blink

components/scheduler/renderer/web_view_scheduler_impl.cc

-// Copyright 2015 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 "components/scheduler/renderer/web_view_scheduler_impl.h"
-
-#include "base/logging.h"
-#include "components/scheduler/base/real_time_domain.h"
-#include "components/scheduler/base/virtual_time_domain.h"
-#include "components/scheduler/child/scheduler_tqm_delegate.h"
-#include "components/scheduler/renderer/auto_advancing_virtual_time_domain.h"
-#include "components/scheduler/renderer/renderer_scheduler_impl.h"
-#include "components/scheduler/renderer/web_frame_scheduler_impl.h"
-#include "third_party/WebKit/public/platform/WebFrameScheduler.h"
-#include "third_party/WebKit/public/web/WebConsoleMessage.h"
-#include "third_party/WebKit/public/web/WebFrame.h"
-#include "third_party/WebKit/public/web/WebView.h"
-
-namespace scheduler {
-
-WebViewSchedulerImpl::WebViewSchedulerImpl(
-    blink::WebView* web_view,
-    RendererSchedulerImpl* renderer_scheduler,
-    bool disable_background_timer_throttling)
-    : web_view_(web_view),
-      renderer_scheduler_(renderer_scheduler),
-      virtual_time_policy_(VirtualTimePolicy::ADVANCE),
-      background_parser_count_(0),
-      page_visible_(true),
-      disable_background_timer_throttling_(disable_background_timer_throttling),
-      allow_virtual_time_to_advance_(true),
-      have_seen_loading_task_(false),
-      virtual_time_(false) {
-  renderer_scheduler->AddWebViewScheduler(this);
-}
-
-WebViewSchedulerImpl::~WebViewSchedulerImpl() {
-  // TODO(alexclarke): Find out why we can't rely on the web view outliving the
-  // frame.
-  for (WebFrameSchedulerImpl* frame_scheduler : frame_schedulers_) {
-    frame_scheduler->DetachFromWebViewScheduler();
-  }
-  renderer_scheduler_->RemoveWebViewScheduler(this);
-}
-
-void WebViewSchedulerImpl::setPageVisible(bool page_visible) {
-  if (disable_background_timer_throttling_ || page_visible_ == page_visible)
-    return;
-
-  page_visible_ = page_visible;
-
-  for (WebFrameSchedulerImpl* frame_scheduler : frame_schedulers_) {
-    frame_scheduler->setPageVisible(page_visible_);
-  }
-}
-
-std::unique_ptr<WebFrameSchedulerImpl>
-WebViewSchedulerImpl::createWebFrameSchedulerImpl(
-    base::trace_event::BlameContext* blame_context) {
-  std::unique_ptr<WebFrameSchedulerImpl> frame_scheduler(
-      new WebFrameSchedulerImpl(renderer_scheduler_, this, blame_context));
-  frame_scheduler->setPageVisible(page_visible_);
-  frame_schedulers_.insert(frame_scheduler.get());
-  return frame_scheduler;
-}
-
-std::unique_ptr<blink::WebFrameScheduler>
-WebViewSchedulerImpl::createFrameScheduler(blink::BlameContext* blame_context) {
-  return createWebFrameSchedulerImpl(blame_context);
-}
-
-void WebViewSchedulerImpl::Unregister(WebFrameSchedulerImpl* frame_scheduler) {
-  DCHECK(frame_schedulers_.find(frame_scheduler) != frame_schedulers_.end());
-  frame_schedulers_.erase(frame_scheduler);
-}
-
-void WebViewSchedulerImpl::AddConsoleWarning(const std::string& message) {
-  if (!web_view_ || !web_view_->mainFrame())
-    return;
-  blink::WebConsoleMessage console_message(
-      blink::WebConsoleMessage::LevelWarning,
-      blink::WebString::fromUTF8(message));
-  web_view_->mainFrame()->addMessageToConsole(console_message);
-}
-
-void WebViewSchedulerImpl::enableVirtualTime() {
-  if (virtual_time_)
-    return;
-
-  virtual_time_ = true;
-  renderer_scheduler_->GetVirtualTimeDomain()->SetCanAdvanceVirtualTime(
-      allow_virtual_time_to_advance_);
-
-  renderer_scheduler_->EnableVirtualTime();
-}
-
-void WebViewSchedulerImpl::setAllowVirtualTimeToAdvance(
-    bool allow_virtual_time_to_advance) {
-  allow_virtual_time_to_advance_ = allow_virtual_time_to_advance;
-
-  if (!virtual_time_)
-    return;
-
-  renderer_scheduler_->GetVirtualTimeDomain()->SetCanAdvanceVirtualTime(
-      allow_virtual_time_to_advance);
-}
-
-bool WebViewSchedulerImpl::virtualTimeAllowedToAdvance() const {
-  return allow_virtual_time_to_advance_;
-}
-
-void WebViewSchedulerImpl::DidStartLoading(unsigned long identifier) {
-  pending_loads_.insert(identifier);
-  have_seen_loading_task_ = true;
-  ApplyVirtualTimePolicy();
-}
-
-void WebViewSchedulerImpl::DidStopLoading(unsigned long identifier) {
-  pending_loads_.erase(identifier);
-  ApplyVirtualTimePolicy();
-}
-
-void WebViewSchedulerImpl::IncrementBackgroundParserCount() {
-  background_parser_count_++;
-  ApplyVirtualTimePolicy();
-}
-
-void WebViewSchedulerImpl::DecrementBackgroundParserCount() {
-  background_parser_count_--;
-  DCHECK_GE(background_parser_count_, 0);
-  ApplyVirtualTimePolicy();
-}
-
-void WebViewSchedulerImpl::setVirtualTimePolicy(VirtualTimePolicy policy) {
-  virtual_time_policy_ = policy;
-
-  switch (virtual_time_policy_) {
-    case VirtualTimePolicy::ADVANCE:
-      setAllowVirtualTimeToAdvance(true);
-      break;
-
-    case VirtualTimePolicy::PAUSE:
-      setAllowVirtualTimeToAdvance(false);
-      break;
-
-    case VirtualTimePolicy::DETERMINISTIC_LOADING:
-      ApplyVirtualTimePolicy();
-      break;
-  }
-}
-
-void WebViewSchedulerImpl::ApplyVirtualTimePolicy() {
-  if (virtual_time_policy_ != VirtualTimePolicy::DETERMINISTIC_LOADING) {
-    return;
-  }
-
-  // We pause virtual time until we've seen a loading task posted, because
-  // otherwise we could advance virtual time arbitarially far before the
-  // first load arrives.
-  setAllowVirtualTimeToAdvance(pending_loads_.size() == 0 &&
-                               background_parser_count_ == 0 &&
-                               have_seen_loading_task_);
-}
-
-}  // namespace scheduler