[WIP] WebFonts cache-aware timeout adaption

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 5105488d1075419512ef874a4c21adde757db359..69613c29dfe0eb68d3fcfa06f52caaaa8a2f8675 100644
--- a/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
@@ -730,6 +730,9 @@ Resource* ResourceFetcher::createResourceForLoading(
   RESOURCE_LOADING_DVLOG(1) << "Loading Resource for "
                             << request.resourceRequest().url().elidedString();
 
+  if (request.isCacheAwareLoadingEnabled())
+    request.mutableResourceRequest().mayActivateCacheAwareLoading();
+
   Resource* resource =
       factory.create(request.resourceRequest(), request.options(), charset);
   resource->setLinkPreload(request.isLinkPreload());
@@ -1121,6 +1124,10 @@ void ResourceFetcher::didFinishLoading(Resource* resource,
   TRACE_EVENT_ASYNC_END0("blink.net", "Resource", resource->identifier());
   DCHECK(resource);
 
+  // Restore original cache policy if cache-aware loading was activated.
+  if (resource->resourceRequest().isCacheAwareLoadingActivated())
+    resource->deactivateCacheAwareLoading();
+
   // When loading a multipart resource, make the loader non-block when finishing
   // loading the first part.
   if (finishReason == DidFinishFirstPartInMultipart)
@@ -1168,6 +1175,17 @@ void ResourceFetcher::didFinishLoading(Resource* resource,
 
 void ResourceFetcher::didFailLoading(Resource* resource,
                                      const ResourceError& error) {
+  if (resource->resourceRequest().isCacheAwareLoadingActivated() &&
+      error.isCacheMiss()) {
+    // Loading from disk cache fails, restore original cache policy and retry.
+    resource->deactivateCacheAwareLoading();
+    resource->willReloadAfterDiskCacheMiss();
+    resource->loader()->start(resource->resourceRequest(),
+                              context().loadingTaskRunner(),
+                              context().defersLoading());
+    return;
+  }
+
   TRACE_EVENT_ASYNC_END0("blink.net", "Resource", resource->identifier());
   removeResourceLoader(resource->loader());
   m_resourceTimingInfoMap.take(const_cast<Resource*>(resource));
@@ -1282,6 +1300,10 @@ bool ResourceFetcher::startLoad(Resource* resource) {
   if (sourceOrigin && sourceOrigin->hasSuborigin())
     request.setSkipServiceWorker(WebURLRequest::SkipServiceWorker::All);
 
+  // TODO(shaochuan): Workaround to persist cache-aware state, remove after
+  // fixed. crbug.com/632580
+  resource->setResourceRequest(request);
+
   ResourceLoader* loader = ResourceLoader::create(this, resource);
   if (resource->shouldBlockLoadEvent())
     m_loaders.add(loader);