[Reland] Per WebViewScheduler virtual time

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/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),
       page_visible_(true),
-      disable_background_timer_throttling_(
-          disable_background_timer_throttling) {
+      disable_background_timer_throttling_(disable_background_timer_throttling),
+      allow_virtual_time_to_advance_(true) {
   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);
+  if (virtual_time_domain_.get())
+    renderer_scheduler_->UnregisterTimeDomain(virtual_time_domain_.get());
 }
 
 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_);
@@ skipping 21 matching lines @@
 
 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::useVirtualTime() {
+  // If we've already switched to virtual time then we don't need to do
+  // anything more.
+  if (virtual_time_domain_.get())
+    return;
+
+  virtual_time_domain_.reset(new AutoAdvancingVirtualTimeDomain(
+      renderer_scheduler_->tick_clock()->NowTicks()));
+  renderer_scheduler_->RegisterTimeDomain(virtual_time_domain_.get());
+
+  virtual_time_domain_->SetCanAdvanceVirtualTime(
+      allow_virtual_time_to_advance_);
+
+  for (WebFrameSchedulerImpl* frame_scheduler : frame_schedulers_) {
+    frame_scheduler->UseVirtualTime(virtual_time_domain_.get());
+  }
+}
+
+void WebViewSchedulerImpl::setAllowVirtualTimeToAdvance(
+    bool allow_virtual_time_to_advance) {
+  if (allow_virtual_time_to_advance_ == allow_virtual_time_to_advance)
+    return;
+
+  allow_virtual_time_to_advance_ = allow_virtual_time_to_advance;
+
+  for (WebFrameSchedulerImpl* frame_scheduler : frame_schedulers_) {
+    frame_scheduler->SetCanAdvanceVirtualTime(allow_virtual_time_to_advance);
+  }
+
+  if (virtual_time_domain_.get()) {

[Sami, 2016/02/01 11:15:07]

Should we DCHECK(virtual_time_domain_) instead? If someone is calling this
without enabling virtual time first, we probably shouldn't fail silently.

[alex clarke (OOO till 29th), 2016/02/01 14:16:54]

But it doesn't fail :) See line 92

+    virtual_time_domain_->SetCanAdvanceVirtualTime(
+        allow_virtual_time_to_advance);
+  }
+}
+
 }  // namespace scheduler