Revert of Move throttling of background timers into the renderer scheduler

third_party/WebKit/Source/platform/Timer.h

Index: third_party/WebKit/Source/platform/Timer.h
diff --git a/third_party/WebKit/Source/platform/Timer.h b/third_party/WebKit/Source/platform/Timer.h
index d6616a853d70078b6e6b0a489b1a64c7346450fc..f2c4aa3228fbab097a0055f22c7dd5d0ee6b3716 100644
--- a/third_party/WebKit/Source/platform/Timer.h
+++ b/third_party/WebKit/Source/platform/Timer.h
@@ -61,6 +61,7 @@
     const WebTraceLocation& location() const { return m_location; }
 
     double nextFireInterval() const;
+    double nextUnalignedFireInterval() const;
     double repeatInterval() const { return m_repeatInterval; }
 
     void augmentRepeatInterval(double delta) {
@@ -68,6 +69,8 @@
         setNextFireTime(now, m_nextFireTime - now + delta);
         m_repeatInterval += delta;
     }
+
+    void didChangeAlignmentInterval(double now);
 
     struct PLATFORM_EXPORT Comparator {
         bool operator()(const TimerBase* a, const TimerBase* b) const;
@@ -118,6 +121,7 @@
     };
 
     double m_nextFireTime; // 0 if inactive
+    double m_unalignedNextFireTime; // m_nextFireTime not considering alignment interval
     double m_repeatInterval; // 0 if not repeating
     WebTraceLocation m_location;
     CancellableTimerTask* m_cancellableTimerTask; // NOT OWNED