Add an opt-out header for HTTP throttling. Never throttle for localhost.

chrome/service/cloud_print/cloud_print_url_fetcher_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "base/command_line.h"
 #include "base/message_loop_proxy.h"
 #include "base/ref_counted.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "chrome/common/net/url_request_context_getter.h"
@@ skipping 267 matching lines @@
 CloudPrintURLFetcherRetryBackoffTest::HandleRawData(const URLFetcher* source,
                                                     const GURL& url,
                                                     const std::string& data) {
   response_count_++;
   // First attempt + 11 retries = 12 total responses.
   EXPECT_LE(response_count_, 12);
   return CloudPrintURLFetcher::RETRY_REQUEST;
 }
 
 void CloudPrintURLFetcherRetryBackoffTest::OnRequestGiveUp() {
-  const TimeDelta one_second = TimeDelta::FromMilliseconds(1000);
-  // It takes more than 1 second to finish all 11 requests.
-  EXPECT_TRUE(Time::Now() - start_time_ >= one_second);
+  // It takes more than 200 ms to finish all 11 requests.
+  EXPECT_TRUE(Time::Now() - start_time_ >= TimeDelta::FromMilliseconds(200));

[wtc, 2011/03/25 19:06:24]

Just curious: is one second too long?  How do we come up with
the expected elapsed time (one second or 200 ms)?

[Jói, 2011/03/25 21:26:51]

It's dependent on the default exponential back-off parameters, which I am
modifying in this change to be more lenient, in particular we now ignore the
first few errors.

   io_message_loop_proxy()->PostTask(FROM_HERE, new MessageLoop::QuitTask());
 }
 
 // http://code.google.com/p/chromium/issues/detail?id=60426
 TEST_F(CloudPrintURLFetcherBasicTest, FLAKY_HandleRawResponse) {
   net::TestServer test_server(net::TestServer::TYPE_HTTP, FilePath(kDocRoot));
   ASSERT_TRUE(test_server.Start());
   SetHandleRawResponse(true);
 
   CreateFetcher(test_server.GetURL("echo"), 0);
@@ skipping 11 matching lines @@
 }
 
 TEST_F(CloudPrintURLFetcherOverloadTest, Protect) {
   net::TestServer test_server(net::TestServer::TYPE_HTTP, FilePath(kDocRoot));
   ASSERT_TRUE(test_server.Start());
 
   GURL url(test_server.GetURL("defaultresponse"));
 
   // Registers an entry for test url. It only allows 3 requests to be sent
   // in 200 milliseconds.
+  net::URLRequestThrottlerManager* manager =
+      net::URLRequestThrottlerManager::GetInstance();
   scoped_refptr<net::URLRequestThrottlerEntry> entry(
-      new net::URLRequestThrottlerEntry(200, 3, 1, 2.0, 0.0, 256));
-  net::URLRequestThrottlerManager::GetInstance()->OverrideEntryForTests(
-      url, entry);
+      new net::URLRequestThrottlerEntry(manager, 200, 3, 1, 2.0, 0.0, 256));
+  manager->OverrideEntryForTests(url, entry);
 
   CreateFetcher(url, 11);
 
   MessageLoop::current()->Run();
 
   net::URLRequestThrottlerManager::GetInstance()->EraseEntryForTests(url);
 }
 
 // http://code.google.com/p/chromium/issues/detail?id=60426
 TEST_F(CloudPrintURLFetcherRetryBackoffTest, FLAKY_GiveUp) {
   net::TestServer test_server(net::TestServer::TYPE_HTTP, FilePath(kDocRoot));
   ASSERT_TRUE(test_server.Start());
 
   GURL url(test_server.GetURL("defaultresponse"));
 
   // Registers an entry for test url. The backoff time is calculated by:
   //     new_backoff = 2.0 * old_backoff + 0
   // and maximum backoff time is 256 milliseconds.
   // Maximum retries allowed is set to 11.
+  net::URLRequestThrottlerManager* manager =
+      net::URLRequestThrottlerManager::GetInstance();
   scoped_refptr<net::URLRequestThrottlerEntry> entry(
-      new net::URLRequestThrottlerEntry(200, 3, 1, 2.0, 0.0, 256));
-  net::URLRequestThrottlerManager::GetInstance()->OverrideEntryForTests(
-      url, entry);
+      new net::URLRequestThrottlerEntry(manager, 200, 3, 1, 2.0, 0.0, 256));
+  manager->OverrideEntryForTests(url, entry);
 
   CreateFetcher(url, 11);
 
   MessageLoop::current()->Run();
 
   net::URLRequestThrottlerManager::GetInstance()->EraseEntryForTests(url);
 }
 
 }  // namespace.