Give user the ability to disable the URL request throttler:

- Support the command line switch --disable-enforced-throttling. With this switch specified, the URL request throttler won't reject outgoing requests during the back-off peroid. Please note that in this case we still keep track of the back-off period, since we need it to determine retry intervals.
- Add a more detailed error page description for net::ERR_TEMPORARILY_THROTTLED.

BUG=66062
TEST=Without --disable-enforced-throttling switch:
  (1) Type in the addresss bar a URL which is expected to return 5XX.
  (2) Keep clicking the "reload" button.
  (3) After a few clicks, Chrome displays an error page explaining why a net::ERR_TEMPORARILY_THROTTLED error occurs.

With --disable-enforced-throttling switch:
  Following step (1) and (2) described above won't result in a net::ERR_TEMPORARILY_THROTTLED error page.

Review URL: http://codereview.chromium.org/5961008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70022 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/chrome/browser/browser_main.cc b/chrome/browser/browser_main.cc
index 7f535f6..030e1ee 100644
--- a/chrome/browser/browser_main.cc
+++ b/chrome/browser/browser_main.cc
@@ -100,6 +100,7 @@
 #include "net/spdy/spdy_session.h"
 #include "net/spdy/spdy_session_pool.h"
 #include "net/url_request/url_request.h"
+#include "net/url_request/url_request_throttler_manager.h"
 
 #if defined(USE_LINUX_BREAKPAD)
 #include "base/linux_util.h"
@@ -586,6 +587,11 @@ void InitializeNetworkOptions(const CommandLine& parsed_command_line) {
     net::SpdySessionPool::set_max_sessions_per_domain(value);
   }
 
+  if (parsed_command_line.HasSwitch(switches::kDisableEnforcedThrottling)) {
+    net::URLRequestThrottlerManager::GetInstance()->
+        set_enforce_throttling(false);
+  }
+
   SetDnsCertProvenanceCheckerFactory(CreateChromeDnsCertProvenanceChecker);
 }