[Android Webview] Refactor LoadUrlTest and work on embedded_test_server custom handler

net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl

Index: net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl
diff --git a/net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl b/net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl
index 366210a1c78f97154725b6f62508b9d3660926a7..f3ca34c830c6d2245b4bc9194489df5319c60c73 100644
--- a/net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl
+++ b/net/test/android/javatests/src/org/chromium/net/test/IEmbeddedTestServerImpl.aidl
@@ -23,6 +23,19 @@ interface IEmbeddedTestServerImpl {
      */
     void addDefaultHandlers(String directoryPath);
 
+    /** Get array of custom handler methods pointers.
+     *
+     *  @return The handler pointers as a long array.
+     */
+    long[] getCustomHandlers();
+    
+    /** Register multiple request handlers.
+     *  Handlers must be registered before starting the server.
+     *
+     *  @param handlers The pointers of handlers to be registered.
+     */
+    void registerRequestHandlers(inout long[] handlers);
+
     /** Serve files from the provided directory.
      *
      *  @param directoryPath The path of the directory from which files should be served.