SafeBrowsing: Implement cache lookup for full hash checks

components/safe_browsing_db/database_manager.h

Index: components/safe_browsing_db/database_manager.h
diff --git a/components/safe_browsing_db/database_manager.h b/components/safe_browsing_db/database_manager.h
index 2b55d3dc5a25679307fa65d2b2d9ec00c036fc34..e2f94383494d5ca376ae177e78448f455ec39e3e 100644
--- a/components/safe_browsing_db/database_manager.h
+++ b/components/safe_browsing_db/database_manager.h
@@ -180,12 +180,16 @@ class SafeBrowsingDatabaseManager
     SafeBrowsingApiCheck(const GURL& url,
                          const std::vector<SBPrefix>& prefixes,
                          const std::vector<SBFullHash>& full_hashes,
+                         const std::vector<SBFullHashResult>& cached_results,
                          Client* client);
     ~SafeBrowsingApiCheck();
 
     const GURL& url() {return url_;}
     const std::vector<SBPrefix>& prefixes() {return prefixes_;}
     const std::vector<SBFullHash>& full_hashes() {return full_hashes_;}
+    const std::vector<SBFullHashResult>& cached_results() {
+        return cached_results_;
+    }
     SafeBrowsingDatabaseManager::Client* client() {return client_;}
 
    private:
@@ -197,6 +201,9 @@ class SafeBrowsingDatabaseManager
     // Full hashes for this check.
     std::vector<SBFullHash> full_hashes_;
 
+    // Cached results for this check.
+    std::vector<SBFullHashResult> cached_results_;
+
     // Not owned.
     SafeBrowsingDatabaseManager::Client* client_;
 
@@ -223,6 +230,10 @@ class SafeBrowsingDatabaseManager
                            ResultsAreCached);
   FRIEND_TEST_ALL_PREFIXES(SafeBrowsingDatabaseManagerTest,
                            ResultsAreNotCachedOnNull);
+  FRIEND_TEST_ALL_PREFIXES(SafeBrowsingDatabaseManagerTest,
+                           GetCachedResults);
+  FRIEND_TEST_ALL_PREFIXES(SafeBrowsingDatabaseManagerTest,
+                           CachedResultsMerged);
 
   typedef std::set<SafeBrowsingApiCheck*> ApiCheckSet;
   typedef std::map<SBPrefix, SBCachedFullHashResult> PrefixToFullHashResultsMap;
@@ -235,6 +246,19 @@ class SafeBrowsingDatabaseManager
       const std::vector<SBFullHashResult>& full_hash_results,
       const base::Time& negative_cache_expire);
 
+  // Fills |prefixes| with the prefixes that need a request. Fills
+  // |cached_results| with the cached results.
+  void GetCachedResults(const std::vector<SBFullHash>& full_hashes,
+                        base::Time now,
+                        std::vector<SBPrefix>* prefixes,
+                        std::vector<SBFullHashResult>* cached_results);
+
+  // Populates |md| with permission metadata from all results that have a match
+  // in |full_hashes|.
+  void PopulateMetadataResult(const std::vector<SBFullHashResult>& results,
+                              const std::vector<SBFullHash>& full_hashes,
+                              ThreatMetadata* md);
+
   // In-progress checks. This set owns the SafeBrowsingApiCheck pointers and is
   // responsible for deleting them when removing from the set.
   ApiCheckSet api_checks_;