Allow embedded_test_server to serve from multiple directories

net/test/embedded_test_server/embedded_test_server.h

Index: net/test/embedded_test_server/embedded_test_server.h
diff --git a/net/test/embedded_test_server/embedded_test_server.h b/net/test/embedded_test_server/embedded_test_server.h
index 8746f0d9a2699b20961d29311b0116950ea0642e..b205391be08c31bd2689c51a5788e06e44554c15 100644
--- a/net/test/embedded_test_server/embedded_test_server.h
+++ b/net/test/embedded_test_server/embedded_test_server.h
@@ -144,6 +144,11 @@ class EmbeddedTestServer : public StreamListenSocket::Delegate {
   // (i.e. "/foo/bar.html" is served by "foo/bar.html" under |directory|).
   void ServeFilesFromDirectory(const base::FilePath& directory);
 
+  // Similar to the above method, but takes multiple directories. The first
+  // matched file would be served.
+  void ServeFilesFromDirectories(
+      const std::vector<base::FilePath>& directories);
+
   // The most general purpose method. Any request processing can be added using
   // this method. Takes ownership of the object. The |callback| is called
   // on UI thread.