[WIP] WebFonts cache-aware timeout adaption

third_party/WebKit/Source/platform/network/ResourceRequest.cpp

Index: third_party/WebKit/Source/platform/network/ResourceRequest.cpp
diff --git a/third_party/WebKit/Source/platform/network/ResourceRequest.cpp b/third_party/WebKit/Source/platform/network/ResourceRequest.cpp
index dd9afd70463b65ca5578de5a29332df80b5968fd..92ff417cba6f04d50141e5ff48583cbe0eb4a0e5 100644
--- a/third_party/WebKit/Source/platform/network/ResourceRequest.cpp
+++ b/third_party/WebKit/Source/platform/network/ResourceRequest.cpp
@@ -88,6 +88,9 @@ ResourceRequest::ResourceRequest(CrossThreadResourceRequestData* data)
   m_uiStartTime = data->m_uiStartTime;
   m_isExternalRequest = data->m_isExternalRequest;
   m_inputPerfMetricReportPolicy = data->m_inputPerfMetricReportPolicy;
+  m_isCacheAwareLoadingEnabled = data->m_isCacheAwareLoadingEnabled;
+  m_isCacheAwareLoadingActivated = data->m_isCacheAwareLoadingActivated;
+  m_savedCachePolicy = data->m_savedCachePolicy;
   m_redirectStatus = data->m_redirectStatus;
 }
 
@@ -136,6 +139,9 @@ std::unique_ptr<CrossThreadResourceRequestData> ResourceRequest::copyData()
   data->m_uiStartTime = m_uiStartTime;
   data->m_isExternalRequest = m_isExternalRequest;
   data->m_inputPerfMetricReportPolicy = m_inputPerfMetricReportPolicy;
+  data->m_isCacheAwareLoadingEnabled = m_isCacheAwareLoadingEnabled;
+  data->m_isCacheAwareLoadingActivated = m_isCacheAwareLoadingActivated;
+  data->m_savedCachePolicy = m_savedCachePolicy;
   data->m_redirectStatus = m_redirectStatus;
   return data;
 }
@@ -387,6 +393,35 @@ bool ResourceRequest::hasCacheValidatorFields() const {
          !m_httpHeaderFields.get(HTTPNames::ETag).isEmpty();
 }
 
+void ResourceRequest::mayActivateCacheAwareLoading() {
+  if (!m_isCacheAwareLoadingEnabled)
+    return;
+
+  switch (m_cachePolicy) {
+    case WebCachePolicy::BypassingCache:
+    case WebCachePolicy::ReturnCacheDataDontLoad:
+      return;
+    case WebCachePolicy::UseProtocolCachePolicy:
+    case WebCachePolicy::ValidatingCacheData:
+    case WebCachePolicy::ReturnCacheDataElseLoad:
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  m_savedCachePolicy = m_cachePolicy;
+  // TODO(570205): Stale data may be retrieved with this flag. Switch to new
+  // flag to load from disk cache with validation when available in net.
+  m_cachePolicy = WebCachePolicy::ReturnCacheDataDontLoad;
+  m_isCacheAwareLoadingActivated = true;
+}
+
+void ResourceRequest::deactivateCacheAwareLoading() {
+  DCHECK(m_isCacheAwareLoadingActivated);
+  m_cachePolicy = m_savedCachePolicy;
+  m_isCacheAwareLoadingActivated = false;
+}
+
 void ResourceRequest::initialize(const KURL& url) {
   m_url = url;
   m_cachePolicy = WebCachePolicy::UseProtocolCachePolicy;
@@ -419,6 +454,9 @@ void ResourceRequest::initialize(const KURL& url) {
   m_inputPerfMetricReportPolicy = InputToLoadPerfMetricReportPolicy::NoReport;
   m_redirectStatus = RedirectStatus::NoRedirect;
   m_requestorOrigin = SecurityOrigin::createUnique();
+  m_isCacheAwareLoadingEnabled = false;
+  m_isCacheAwareLoadingActivated = false;
+  m_savedCachePolicy = WebCachePolicy::UseProtocolCachePolicy;
 }
 
 }  // namespace blink