Implement exponential back-off mechanism.

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 667 matching lines @@
         'url_request/url_request_job_tracker.h',
         'url_request/url_request_netlog_params.cc',
         'url_request/url_request_netlog_params.h',
         'url_request/url_request_redirect_job.cc',
         'url_request/url_request_redirect_job.h',
         'url_request/url_request_simple_job.cc',
         'url_request/url_request_simple_job.h',
         'url_request/url_request_status.h',
         'url_request/url_request_test_job.cc',
         'url_request/url_request_test_job.h',
+        'url_request/url_request_throttler_entry.cc',
+        'url_request/url_request_throttler_entry.h',
+        'url_request/url_request_throttler_entry_interface.h',
+        'url_request/url_request_throttler_header_adapter.h',
+        'url_request/url_request_throttler_header_adapter.cc',
+        'url_request/url_request_throttler_header_interface.h',
+        'url_request/url_request_throttler_manager.cc',
+        'url_request/url_request_throttler_manager.h',
         'url_request/view_cache_helper.cc',
         'url_request/view_cache_helper.h',
         'websockets/websocket.cc',
         'websockets/websocket.h',
         'websockets/websocket_frame_handler.cc',
         'websockets/websocket_frame_handler.h',
         'websockets/websocket_handshake.cc',
         'websockets/websocket_handshake.h',
         'websockets/websocket_handshake_draft75.cc',
         'websockets/websocket_handshake_draft75.h',
@@ skipping 255 matching lines @@
         'spdy/spdy_test_util.cc',
         'spdy/spdy_test_util.h',
         'test/python_utils_unittest.cc',
         'tools/dump_cache/url_to_filename_encoder.cc',
         'tools/dump_cache/url_to_filename_encoder.h',
         'tools/dump_cache/url_to_filename_encoder_unittest.cc',
         'tools/dump_cache/url_utilities.h',
         'tools/dump_cache/url_utilities.cc',
         'tools/dump_cache/url_utilities_unittest.cc',
         'url_request/url_request_job_tracker_unittest.cc',
+        'url_request/url_request_throttler_unittest.cc',
         'url_request/url_request_unittest.cc',
         'url_request/url_request_unittest.h',
         'url_request/view_cache_helper_unittest.cc',
         'websockets/websocket_frame_handler_unittest.cc',
         'websockets/websocket_handshake_draft75_unittest.cc',
         'websockets/websocket_handshake_handler_unittest.cc',
         'websockets/websocket_handshake_unittest.cc',
         'websockets/websocket_job_unittest.cc',
         'websockets/websocket_net_log_params_unittest.cc',
         'websockets/websocket_throttle_unittest.cc',
@@ skipping 467 matching lines @@
       ],
     }],
   ],
 }
 
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