predictors: Pass manifests from Bork to store in ResourcePrefetchPredictor.

components/precache/core/precache_fetcher.h

Index: components/precache/core/precache_fetcher.h
diff --git a/components/precache/core/precache_fetcher.h b/components/precache/core/precache_fetcher.h
index 9868d1c015a84d0f26922e4971f162cb5dd8f389..b8c937abb47227bce42670e6cc404eb796a34bad 100644
--- a/components/precache/core/precache_fetcher.h
+++ b/components/precache/core/precache_fetcher.h
@@ -128,6 +128,10 @@ class PrecacheFetcher : public base::SupportsWeakPtr<PrecacheFetcher> {
     // were fetched or not. If the PrecacheFetcher is destroyed before OnDone is
     // called, then precaching will be canceled and OnDone will not be called.
     virtual void OnDone() = 0;
+
+    // Called when a precache manifest has been successfully fetched and parsed.
+    virtual void OnManifestFetched(const std::string& host,
+                                   const PrecacheManifest& manifest) = 0;
   };
 
   // Visible for testing.