SafeBrowsing: Implement cache lookup for full hash checks

components/safe_browsing_db/util.h

Index: components/safe_browsing_db/util.h
diff --git a/components/safe_browsing_db/util.h b/components/safe_browsing_db/util.h
index 78d6bbd242e2416e72cdccd9e74f48e5d1f82512..2d8bfb8322c40c1bd4235848d8819fcd1ef9a0b3 100644
--- a/components/safe_browsing_db/util.h
+++ b/components/safe_browsing_db/util.h
@@ -51,6 +51,9 @@ enum SBThreatType {
   // Url leads to a blacklisted resource script. Note that no warnings should be
   // shown on this threat type, but an incident report might be sent.
   SB_THREAT_TYPE_BLACKLISTED_RESOURCE,
+
+  // Url abuses a permission API.
+  SB_THREAT_TYPE_API_ABUSE,
 };
 
 // Metadata that indicates what kind of URL match this is.