Use a resource throttle to implement shouldOverrideUrlLoading.

net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java

Index: net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
diff --git a/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java b/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
index c698edbcf464d3132032c7f60d7dbb075b673c86..5815bc1eee207cfd15e3b254d11d5870ce5b2c5b 100644
--- a/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
+++ b/net/test/android/javatests/src/org/chromium/net/test/util/TestWebServer.java
@@ -73,6 +73,7 @@ public class TestWebServer {
     private String mServerUri;
     private final boolean mSsl;
     private final int mPort;
+    private long mResponseDelay; // Number of milliseconds to wait before answering a request
 
     private static class Response {
         final byte[] mResponseData;
@@ -126,6 +127,7 @@ public class TestWebServer {
 
         mServerThread = new ServerThread(this, mPort, mSsl);
         mServerUri += "//localhost:" + mServerThread.mSocket.getLocalPort();
+        mResponseDelay = 0;
     }
 
     public static TestWebServer start(int port) throws Exception {
@@ -465,6 +467,10 @@ public class TestWebServer {
         assert Thread.currentThread() == mServerThread
                 : "getResponse called from non-server thread";
 
+        if (mResponseDelay > 0) {
+            Thread.sleep(mResponseDelay);
+        }
+
         RequestLine requestLine = request.getRequestLine();
         HttpResponse httpResponse = null;
         Log.i(TAG, requestLine.getMethod() + ": " + requestLine.getUri());
@@ -562,6 +568,10 @@ public class TestWebServer {
         return entity;
     }
 
+    public void setResponseDelay(long responseDelay) {
+        mResponseDelay = responseDelay;
+    }
+
     private static class ServerThread extends Thread {
         private TestWebServer mServer;
         private ServerSocket mSocket;