Turn on render throttling for iframes with pending sheets.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index efdafbb7fdf63f77b1607c3fe6f9da43f9fb6e09..04d712253f6bacf1f5c64106a80121b4e7a309b3 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -5205,17 +5205,7 @@ void Document::beginLifecycleUpdatesIfRenderingReady() {
     return;
   if (!isRenderingReady())
     return;
-  if (LocalFrame* frame = this->frame()) {
-    // Avoid pumping frames for the initially empty document.
-    if (!frame->loader().stateMachine()->committedFirstRealDocumentLoad())
-      return;
-    // The compositor will "defer commits" for the main frame until we
-    // explicitly request them.
-    if (frame->isMainFrame())
-      frame->page()->chromeClient().beginLifecycleUpdates();
-    if (frame->view())
-      frame->view()->setupRenderThrottling();
-  }
+  view()->beginLifecycleUpdates();
 }
 
 Vector<IconURL> Document::iconURLs(int iconTypesMask) {