[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 f2a2eb2c92c6d238432b5a5f95994d5a5b77db8f..6ec02ce9c403f78b2fe98a81ad9b438711c8c7e6 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -90,17 +90,16 @@ 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);
     case Resource::LinkPrefetch:
-        return new Resource(request, Resource::LinkPrefetch);
     case Resource::LinkSubresource:
-        return new Resource(request, Resource::LinkSubresource);
+    case Resource::Manifest:
+        return new Resource(request, type);
     case Resource::Shader:
         return new ShaderResource(request);
-    case Resource::ImportResource:
-        return new RawResource(request, type);
     }
 
     ASSERT_NOT_REACHED();
@@ -122,6 +121,7 @@ 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
@@ -210,6 +210,7 @@ static ResourceRequest::TargetType requestTargetType(const ResourceFetcher* fetc
     case Resource::Shader:
     case Resource::Raw:
     case Resource::ImportResource:
+    case Resource::Manifest:
         return ResourceRequest::TargetIsSubresource;
     case Resource::LinkPrefetch:
         return ResourceRequest::TargetIsPrefetch;
@@ -400,6 +401,11 @@ ResourcePtr<RawResource> ResourceFetcher::fetchTextTrack(FetchRequest& request)
     return toRawResource(requestResource(Resource::TextTrack, request));
 }
 
+ResourcePtr<Resource> ResourceFetcher::fetchManifest(FetchRequest& request)
+{
+    return requestResource(Resource::Manifest, request);
+}
+
 void ResourceFetcher::preCacheSubstituteDataForMainResource(const FetchRequest& request, const SubstituteData& substituteData)
 {
     const KURL& url = request.url();
@@ -446,6 +452,7 @@ 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;
@@ -503,6 +510,7 @@ bool ResourceFetcher::canRequest(Resource::Type type, const KURL& url, const Res
     case Resource::Shader:
     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)) {
@@ -563,6 +571,7 @@ 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: