Create NetworkQuietDetector.

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
index 33496cf903a19222ac13f380d9c5337bbe276ccf..aecba9da1d46a518c77ddcaab3a9eb2f4aace74a 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -54,6 +54,7 @@
 #include "core/loader/FrameLoader.h"
 #include "core/loader/MixedContentChecker.h"
 #include "core/loader/NetworkHintsInterface.h"
+#include "core/loader/NetworkQuietDetector.h"
 #include "core/loader/PingLoader.h"
 #include "core/loader/ProgressTracker.h"
 #include "core/loader/SubresourceFilter.h"
@@ -592,6 +593,7 @@ void FrameFetchContext::DidLoadResource(Resource* resource) {
   if (!document_)
     return;
   FirstMeaningfulPaintDetector::From(*document_).CheckNetworkStable();
+  NetworkQuietDetector::From(*document_).CheckNetworkStable();
   if (resource->IsLoadEventBlockingResourceType())
     document_->CheckCompleted();
 }