Make ResourceScheduler work in OOPIF

content/browser/loader/resource_scheduler.cc

Index: content/browser/loader/resource_scheduler.cc
diff --git a/content/browser/loader/resource_scheduler.cc b/content/browser/loader/resource_scheduler.cc
index 1cd91c3e6c0b7725ae9ea25d32ae004930c45e8b..6973687cb719a615ca3675eec90e37d80ff89714 100644
--- a/content/browser/loader/resource_scheduler.cc
+++ b/content/browser/loader/resource_scheduler.cc
@@ -421,6 +421,10 @@ class ResourceScheduler::Client {
   }
 
   void OnWillInsertBody() {
+    // Can be called multiple times per RVH in the case of out-of-process
+    // iframes.
+    if (has_html_body_)
+      return;
     has_html_body_ = true;
     LoadAnyStartablePendingRequests(RequestStartTrigger::BODY_REACHED);
   }