Add a flag disable background timer alignment

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/renderer_scheduler_impl.h"
 #include "components/scheduler/renderer/web_frame_scheduler_impl.h"
 #include "third_party/WebKit/public/platform/WebFrameScheduler.h"
 
 namespace scheduler {
 
 WebViewSchedulerImpl::WebViewSchedulerImpl(
     blink::WebView* web_view,
-    RendererSchedulerImpl* renderer_scheduler)
+    RendererSchedulerImpl* renderer_scheduler,
+    bool disable_background_timer_throttling)
     : web_view_(web_view),
       renderer_scheduler_(renderer_scheduler),
-      page_in_background_(false) {}
+      page_in_background_(false),
+      disable_background_timer_throttling_(
+          disable_background_timer_throttling) {}
 
 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();
   }
 }
 
 void WebViewSchedulerImpl::setPageInBackground(bool page_in_background) {
-  if (page_in_background_ == page_in_background)
+  if (disable_background_timer_throttling_ ||
+      page_in_background_ == page_in_background)
     return;
 
   page_in_background_ = page_in_background;
 
   for (WebFrameSchedulerImpl* frame_scheduler : frame_schedulers_) {
     frame_scheduler->SetPageInBackground(page_in_background_);
   }
 }
 
 scoped_ptr<WebFrameSchedulerImpl>
 WebViewSchedulerImpl::createWebFrameSchedulerImpl() {
   scoped_ptr<WebFrameSchedulerImpl> frame_scheduler(
       new WebFrameSchedulerImpl(renderer_scheduler_, this));
   frame_scheduler->SetPageInBackground(page_in_background_);
   frame_schedulers_.insert(frame_scheduler.get());
   return frame_scheduler.Pass();
 }
 
 blink::WebPassOwnPtr<blink::WebFrameScheduler>
 WebViewSchedulerImpl::createFrameScheduler() {
   return blink::adoptWebPtr(createWebFrameSchedulerImpl().release());
 }
 
 void WebViewSchedulerImpl::Unregister(WebFrameSchedulerImpl* frame_scheduler) {
   DCHECK(frame_schedulers_.find(frame_scheduler) != frame_schedulers_.end());
   frame_schedulers_.erase(frame_scheduler);
 }
 
 }  // namespace scheduler