net: Add SetUploadStream method to URLFetcher.

net/tools/testserver/testserver.py

Index: net/tools/testserver/testserver.py
diff --git a/net/tools/testserver/testserver.py b/net/tools/testserver/testserver.py
index 93de5cab3970c5ccfce3f9c588d34753125fe3fb..0592b4a151993640a3177a46a8889185cf682315 100755
--- a/net/tools/testserver/testserver.py
+++ b/net/tools/testserver/testserver.py
@@ -674,7 +674,12 @@ class TestPageHandler(testserver_base.BasePageHandler):
     if not self._ShouldHandleRequest("/echo"):
       return False
 
-    self.send_response(200)
+    _, _, _, _, query, _ = urlparse.urlparse(self.path)
+    query_params = cgi.parse_qs(query, True)
+    if 'status' in query_params:
+      self.send_response(int(query_params['status'][0]))
+    else:
+      self.send_response(200)
     self.send_header('Content-Type', 'text/html')
     self.end_headers()
     self.wfile.write(self.ReadRequestBody())