Implement exponential back-off mechanism and enforce it at the URLRequestHttpJob level.

net/net.gyp

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 554 matching lines @@
         'proxy/proxy_script_fetcher.h',
         'proxy/proxy_script_fetcher_impl.cc',
         'proxy/proxy_script_fetcher_impl.h',
         'proxy/proxy_server.cc',
         'proxy/proxy_server_mac.cc',
         'proxy/proxy_server.h',
         'proxy/proxy_service.cc',
         'proxy/proxy_service.h',
         'proxy/sync_host_resolver_bridge.cc',
         'proxy/sync_host_resolver_bridge.h',
+        'request_throttler/request_throttler_entry.cc',
+        'request_throttler/request_throttler_entry.h',
+        'request_throttler/request_throttler_entry_interface.h',
+        'request_throttler/request_throttler_header_adapter.h',
+        'request_throttler/request_throttler_header_adapter.cc',
+        'request_throttler/request_throttler_header_interface.h',
+        'request_throttler/request_throttler_manager.cc',
+        'request_throttler/request_throttler_manager.h',
         'socket/client_socket.cc',
         'socket/client_socket.h',
         'socket/client_socket_factory.cc',
         'socket/client_socket_factory.h',
         'socket/client_socket_handle.cc',
         'socket/client_socket_handle.h',
         'socket/client_socket_pool.h',
         'socket/client_socket_pool.cc',
         'socket/client_socket_pool_base.cc',
         'socket/client_socket_pool_base.h',
@@ skipping 327 matching lines @@
         'proxy/proxy_config_service_linux_unittest.cc',
         'proxy/proxy_config_service_win_unittest.cc',
         'proxy/proxy_config_unittest.cc',
         'proxy/proxy_list_unittest.cc',
         'proxy/proxy_resolver_js_bindings_unittest.cc',
         'proxy/proxy_resolver_v8_unittest.cc',
         'proxy/proxy_script_fetcher_impl_unittest.cc',
         'proxy/proxy_server_unittest.cc',
         'proxy/proxy_service_unittest.cc',
         'proxy/sync_host_resolver_bridge_unittest.cc',
+        'request_throttler/request_throttler_unittest.cc',
         'socket/client_socket_pool_base_unittest.cc',
         'socket/deterministic_socket_data_unittest.cc',
         'socket/socks5_client_socket_unittest.cc',
         'socket/socks_client_socket_pool_unittest.cc',
         'socket/socks_client_socket_unittest.cc',
         'socket/ssl_client_socket_unittest.cc',
         'socket/ssl_client_socket_pool_unittest.cc',
         'socket/tcp_client_socket_pool_unittest.cc',
         'socket/tcp_client_socket_unittest.cc',
         'socket_stream/socket_stream_metrics_unittest.cc',
@@ skipping 462 matching lines @@
       ],
     }],
   ],
 }
 
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