Bug 468568. Part 0.6: Assert when ScheduleViewManagerFlush is called on a non-root. r=mattwoodrow

--HG--
extra : rebase_source : cf014da5cd7472fa036a5922c4ca9fff9aa93eac

layout/base/nsRefreshDriver.cpp

@@ -518,6 +518,15 @@ nsRefreshDriver::IsRefreshObserver(nsARefreshObserver *aObserver,
 }
 #endif
 
+void
+nsRefreshDriver::ScheduleViewManagerFlush()
+{
+  NS_ASSERTION(mPresContext->IsRoot(),
+               "Should only schedule view manager flush on root prescontexts");
+  mViewManagerFlushIsPending = true;
+  EnsureTimerStarted(false);
+}
+
 void
 nsRefreshDriver::ScheduleFrameRequestCallbacks(nsIDocument* aDocument)
 {

layout/base/nsRefreshDriver.h

@@ -148,10 +148,7 @@ public:
   /**
    * Remember whether our presshell's view manager needs a flush
    */
-  void ScheduleViewManagerFlush() {
-    mViewManagerFlushIsPending = true;
-    EnsureTimerStarted(false);
-  }
+  void ScheduleViewManagerFlush();
   void RevokeViewManagerFlush() {
     mViewManagerFlushIsPending = false;
   }