[NotLanded] Implement the fetching algorithm of the Web Manifest.

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 317c51716bbcc49523e575de5e26b6843e25d916..72de9cc755ffedee65a79534db4106ed98ab917b 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -95,15 +95,14 @@ static Resource* createResource(Resource::Type type, const ResourceRequest& requ
     case Resource::Raw:
     case Resource::TextTrack:
     case Resource::Media:
+    case Resource::ImportResource:
         return new RawResource(request, type);
     case Resource::XSLStyleSheet:
         return new XSLStyleSheetResource(request, charset);
     case Resource::LinkPrefetch:
-        return new Resource(request, Resource::LinkPrefetch);
     case Resource::LinkSubresource:
-        return new Resource(request, Resource::LinkSubresource);
-    case Resource::ImportResource:
-        return new RawResource(request, type);
+    case Resource::Manifest:
+        return new Resource(request, type);
     }
 
     ASSERT_NOT_REACHED();
@@ -125,6 +124,7 @@ static ResourceLoadPriority loadPriority(Resource::Type type, const FetchRequest
     case Resource::Script:
     case Resource::Font:
     case Resource::ImportResource:
+    case Resource::Manifest:
         return ResourceLoadPriorityMedium;
     case Resource::Image:
         // We'll default images to VeryLow, and promote whatever is visible. This improves
@@ -213,6 +213,8 @@ static WebURLRequest::RequestContext requestContextFromType(const ResourceFetche
         return WebURLRequest::RequestContextSubresource;
     case Resource::ImportResource:
         return WebURLRequest::RequestContextScript;
+    case Resource::Manifest:
+        return WebURLRequest::RequestContextSubresource;
     case Resource::LinkPrefetch:
         return WebURLRequest::RequestContextPrefetch;
     case Resource::LinkSubresource:
@@ -399,6 +401,13 @@ ResourcePtr<RawResource> ResourceFetcher::fetchTextTrack(FetchRequest& request)
     return toRawResource(requestResource(Resource::TextTrack, request));
 }
 
+ResourcePtr<Resource> ResourceFetcher::fetchManifest(FetchRequest& request)
+{
+    ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
+    request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextSubresource);
+    return requestResource(Resource::Manifest, request);
+}
+
 void ResourceFetcher::preCacheSubstituteDataForMainResource(const FetchRequest& request, const SubstituteData& substituteData)
 {
     const KURL& url = request.url();
@@ -449,6 +458,7 @@ bool ResourceFetcher::checkInsecureContent(Resource::Type type, const KURL& url,
         case Resource::MainResource:
         case Resource::LinkPrefetch:
         case Resource::LinkSubresource:
+        case Resource::Manifest:
             // These cannot affect the current document.
             treatment = TreatAsAlwaysAllowedContent;
             break;
@@ -516,6 +526,7 @@ bool ResourceFetcher::canRequest(Resource::Type type, const KURL& url, const Res
     case Resource::TextTrack:
     case Resource::ImportResource:
     case Resource::Media:
+    case Resource::Manifest:
         // By default these types of resources can be loaded from any origin.
         // FIXME: Are we sure about Resource::Font?
         if (originRestriction == FetchRequest::RestrictToSameOrigin && !securityOrigin->canRequest(url)) {
@@ -585,6 +596,7 @@ bool ResourceFetcher::canRequest(Resource::Type type, const KURL& url, const Res
     case Resource::Raw:
     case Resource::LinkPrefetch:
     case Resource::LinkSubresource:
+    case Resource::Manifest:
         break;
     case Resource::Media:
     case Resource::TextTrack: