content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 51d5b7386acf7007e6b01a26dc54553e4a92d0ec..7546b6a92b3dbb9030b80adb1a11f6dfab714cb1 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -15,6 +15,7 @@
 #include <map>
 #include <set>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
@@ -46,7 +47,9 @@ class ResourceHandler;
 struct ResourceHostMsg_Request;
 
 namespace net {
+class URLRequestContext;
 class URLRequestJobFactory;
+class HttpCache;
 }
 
 namespace storage {
@@ -422,6 +425,16 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                     IPC::Message* sync_result,  // only valid for sync
                     int route_id);  // only valid for async
 
+  void BeginRequestFromData(int request_id,
+                            const ResourceHostMsg_Request& request_data,
+                            IPC::Message* sync_result,
+                            int process_type,
+                            int child_id,
+                            int route_id,
+                            bool is_async_revalidation,
+                            net::URLRequestContext* request_context,
+                            ResourceContext* resource_context);
+
   // Creates a ResourceHandler to be used by BeginRequest() for normal resource
   // loading.
   scoped_ptr<ResourceHandler> CreateResourceHandler(
@@ -431,11 +444,17 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
       int route_id,
       int process_type,
       int child_id,
+      bool is_async_revalidation,
       ResourceContext* resource_context);
 
+  // Wraps |handler| in the BufferedResourceHandler, enabling mime-type sniffing
+  // and redirecting to download or plugins as appropriate.
+  scoped_ptr<ResourceHandler> AddBufferedResourceHandler(
+      net::URLRequest* request,
+      scoped_ptr<ResourceHandler> handler);
+
   // Wraps |handler| in the standard resource handlers for normal resource
-  // loading and navigation requests. This adds BufferedResourceHandler and
-  // ResourceThrottles.
+  // loading and navigation requests. This adds ResourceThrottles.
   scoped_ptr<ResourceHandler> AddStandardHandlers(
       net::URLRequest* request,
       ResourceType resource_type,
@@ -491,6 +510,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                                int child_id,
                                bool is_sync_load);
 
+  void BeginAsyncRevalidation(net::URLRequest* for_request);
+
   LoaderMap pending_loaders_;
 
   // Collection of temp files downloaded for child processes via
@@ -569,6 +590,14 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
 
   bool allow_cross_origin_auth_prompt_;
 
+  // stale-while-revalidate is enabled either via experiment or command-line
+  // flag.
+  bool async_revalidation_enabled_;
+
+  // In progress async revalidations.
+  std::set<std::pair<net::HttpCache*, std::string>>
+      in_progress_async_revalidations_;
+
   // http://crbug.com/90971 - Assists in tracking down use-after-frees on
   // shutdown.
   std::set<const ResourceContext*> active_resource_contexts_;