Extensions: Consolidate extension id hashing / searching.

components/crx_file/id_util.h

Index: components/crx_file/id_util.h
diff --git a/components/crx_file/id_util.h b/components/crx_file/id_util.h
index 4463ff15b77442a2163a9dc02f88b4fee6c4b3da..bd11d96db31bf643d95024c86781c18d78e67e37 100644
--- a/components/crx_file/id_util.h
+++ b/components/crx_file/id_util.h
@@ -21,11 +21,14 @@ extern const size_t kIdSize;
 // always generate the same output ID.
 std::string GenerateId(const std::string& input);
 
-// Generate an ID for an extension in the given path.
+// Generates an ID for an extension in the given path.
 // Used while developing extensions, before they have a key.
 std::string GenerateIdForPath(const base::FilePath& path);
 
-// Normalize the path for use by the extension. On Windows, this will make
+// Returns the hash of an extension ID in hex.
+std::string HashedIdInHex(const std::string& id);
+
+// Normalizes the path for use by the extension. On Windows, this will make
 // sure the drive letter is uppercase.
 base::FilePath MaybeNormalizePath(const base::FilePath& path);