Implement URLRequestBackoffManager for managing Backoff headers

net/net.gypi

 # Copyright 2014 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 1223 matching lines @@
       'url_request/url_request_simple_job.h',
       'url_request/url_request_status.cc',
       '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_manager.cc',
       'url_request/url_request_throttler_manager.h',
+      'url_request/url_request_backoff_manager.cc',
+      'url_request/url_request_backoff_manager.h',
       'url_request/view_cache_helper.cc',
       'url_request/view_cache_helper.h',
       'url_request/websocket_handshake_userdata_key.cc',
       'url_request/websocket_handshake_userdata_key.h',
       'websockets/websocket_basic_handshake_stream.cc',
       'websockets/websocket_basic_handshake_stream.h',
       'websockets/websocket_basic_stream.cc',
       'websockets/websocket_basic_stream.h',
       'websockets/websocket_channel.cc',
       'websockets/websocket_channel.h',
@@ skipping 498 matching lines @@
       'tools/dump_cache/url_to_filename_encoder_unittest.cc',
       'tools/dump_cache/url_utilities.cc',
       'tools/dump_cache/url_utilities.h',
       'tools/dump_cache/url_utilities_unittest.cc',
       'tools/quic/quic_simple_client_test.cc',
       'tools/tld_cleanup/tld_cleanup_util_unittest.cc',
       'udp/udp_socket_unittest.cc',
       'url_request/sdch_dictionary_fetcher_unittest.cc',
       'url_request/url_fetcher_impl_unittest.cc',
       'url_request/url_fetcher_response_writer_unittest.cc',
+      'url_request/url_request_backoff_manager_unittest.cc',
       'url_request/url_request_context_builder_unittest.cc',
       'url_request/url_request_data_job_unittest.cc',
       'url_request/url_request_file_job_unittest.cc',
       'url_request/url_request_filter_unittest.cc',
       'url_request/url_request_ftp_job_unittest.cc',
       'url_request/url_request_http_job_unittest.cc',
       'url_request/url_request_job_factory_impl_unittest.cc',
       'url_request/url_request_job_unittest.cc',
       'url_request/url_request_simple_job_unittest.cc',
       'url_request/url_request_throttler_simulation_unittest.cc',
@@ skipping 70 matching lines @@
       'base/mac/url_conversions_unittest.mm',
     ],
     'net_docs_script': 'tools/net_docs/net_docs.py',
     'net_docs_sources': [
       'README.md',
       'sdch/README.md',
     ],
     'net_docs_output_dir': '<(PRODUCT_DIR)/net/docs',
   }
 }