[scheduler] Report background timer throttling intervention.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.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 "platform/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 1455 matching lines @@
 void RendererSchedulerImpl::ResetForNavigationLocked() {
   helper_.CheckOnValidThread();
   any_thread_lock_.AssertAcquired();
   AnyThread().user_model.Reset(helper_.scheduler_tqm_delegate()->NowTicks());
   AnyThread().have_seen_touchstart = false;
   MainThreadOnly().loading_task_cost_estimator.Clear();
   MainThreadOnly().timer_task_cost_estimator.Clear();
   MainThreadOnly().idle_time_estimator.Clear();
   MainThreadOnly().have_seen_a_begin_main_frame = false;
   MainThreadOnly().have_reported_blocking_intervention_since_navigation = false;
+  for (WebViewSchedulerImpl* web_view_scheduler :
+       MainThreadOnly().web_view_schedulers) {
+    web_view_scheduler->OnNavigation();
+  }
   UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
 }
 
 void RendererSchedulerImpl::SetTopLevelBlameContext(
     base::trace_event::BlameContext* blame_context) {
   // Any task that runs in the default task runners belongs to the context of
   // all frames (as opposed to a particular frame). Note that the task itself
   // may still enter a more specific blame context if necessary.
   //
   // Per-frame task runners (loading, timers, etc.) are configured with a more
@@ skipping 204 matching lines @@
     case v8::PERFORMANCE_LOAD:
       return "load";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink