Anti-DDoS enhancements: Log to net log, UMA stats, improved policy.

chrome/browser/net/passive_log_collector.cc

Index: chrome/browser/net/passive_log_collector.cc
diff --git a/chrome/browser/net/passive_log_collector.cc b/chrome/browser/net/passive_log_collector.cc
index 677e1d774649da600edd9d7ef2b61ffeab9ec4c9..9aa06c64350d80a73ba9e353b57758ccca2e8ba4 100644
--- a/chrome/browser/net/passive_log_collector.cc
+++ b/chrome/browser/net/passive_log_collector.cc
@@ -55,6 +55,8 @@ PassiveLogCollector::PassiveLogCollector()
       ALLOW_THIS_IN_INITIALIZER_LIST(url_request_tracker_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(socket_stream_tracker_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(http_stream_job_tracker_(this)),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          exponential_backoff_throttling_tracker_(this)),
       num_events_seen_(0) {
 
   // Define the mapping between source types and the tracker objects.
@@ -73,6 +75,8 @@ PassiveLogCollector::PassiveLogCollector()
   trackers_[net::NetLog::SOURCE_DISK_CACHE_ENTRY] = &disk_cache_entry_tracker_;
   trackers_[net::NetLog::SOURCE_MEMORY_CACHE_ENTRY] = &mem_cache_entry_tracker_;
   trackers_[net::NetLog::SOURCE_HTTP_STREAM_JOB] = &http_stream_job_tracker_;
+  trackers_[net::NetLog::SOURCE_EXPONENTIAL_BACKOFF_THROTTLING] =
+      &exponential_backoff_throttling_tracker_;
   // Make sure our mapping is up-to-date.
   for (size_t i = 0; i < arraysize(trackers_); ++i)
     DCHECK(trackers_[i]) << "Unhandled SourceType: " << i;
@@ -644,3 +648,25 @@ PassiveLogCollector::HttpStreamJobTracker::DoAddEntry(
 
   return ACTION_NONE;
 }
+
+//----------------------------------------------------------------------------
+// ExponentialBackoffThrottlingTracker
+//----------------------------------------------------------------------------
+
+const size_t PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::kMaxNumSources = 100;
+const size_t PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::kMaxGraveyardSize = 25;
+
+PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::ExponentialBackoffThrottlingTracker(
+        PassiveLogCollector* parent)
+        : SourceTracker(kMaxNumSources, kMaxGraveyardSize, parent) {
+}
+
+PassiveLogCollector::SourceTracker::Action
+PassiveLogCollector::ExponentialBackoffThrottlingTracker::DoAddEntry(
+    const ChromeNetLog::Entry& entry, SourceInfo* out_info) {
+  AddEntryToSourceInfo(entry, out_info);
+  return ACTION_NONE;
+}