Make render pipeline throttling opt-in

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 59b9e3ec9b35cabddbc138f27a570afff5acedcc..a6bf8f50eb780eab3f94ef94bc7015c989a351b7 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -1943,6 +1943,7 @@ void WebViewImpl::beginFrame(double lastFrameTimeMonotonic)
     if (!m_page)
         return;
 
+    DocumentLifecycle::AllowThrottlingScope throttlingScope(mainFrameImpl()->frame()->document()->lifecycle());
     PageWidgetDelegate::animate(*m_page, lastFrameTimeMonotonic);
 }
 
@@ -1952,6 +1953,7 @@ void WebViewImpl::updateAllLifecyclePhases()
     if (!mainFrameImpl())
         return;
 
+    DocumentLifecycle::AllowThrottlingScope throttlingScope(mainFrameImpl()->frame()->document()->lifecycle());
     updateLayerTreeBackgroundColor();
 
     PageWidgetDelegate::updateAllLifecyclePhases(*m_page, *mainFrameImpl()->frame());
@@ -3528,6 +3530,7 @@ WebHitTestResult WebViewImpl::hitTestResultAt(const WebPoint& point)
 
 HitTestResult WebViewImpl::coreHitTestResultAt(const WebPoint& pointInViewport)
 {
+    DocumentLifecycle::AllowThrottlingScope throttlingScope(mainFrameImpl()->frame()->document()->lifecycle());
     FrameView* view = mainFrameImpl()->frameView();
     IntPoint pointInRootFrame = view->contentsToFrame(view->viewportToContents(pointInViewport));
     return hitTestResultForRootFramePos(pointInRootFrame);