[Reland] Post loading tasks on the appropriate WebFrameScheduler's queue

third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp

Index: third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
index 8e095755edf6f51e94fe079d714904411b76b3b5..bea44b316ded1f03541f17ca45fe7a8ce074c47d 100644
--- a/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
@@ -172,6 +172,14 @@ ResourceFetcher::~ResourceFetcher()
 #endif
 }
 
+WebTaskRunner* ResourceFetcher::loadingTaskRunner()
+{
+    if (!m_context)
+        return nullptr;
+
+    return m_context->loadingTaskRunner();
+}
+
 Resource* ResourceFetcher::cachedResource(const KURL& resourceURL) const
 {
     KURL url = MemoryCache::removeFragmentIdentifierIfNeeded(resourceURL);