diff --git a/content/browser/plugin_service_impl.cc b/content/browser/plugin_service_impl.cc
index f11603d6..7b2f2c6 100644
--- a/content/browser/plugin_service_impl.cc
+++ b/content/browser/plugin_service_impl.cc
@@ -626,6 +626,41 @@
     plugin->ForceShutdown();
 }
 
+static const unsigned int kMaxCrashesPerInterval = 3;
+static const unsigned int kCrashesInterval = 120;
+
+void PluginServiceImpl::RegisterPluginCrash(const FilePath& path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  std::map<FilePath, std::vector<base::Time> >::iterator i =
+      crash_times_.find(path);
+  if (i == crash_times_.end()) {
+    crash_times_[path] = std::vector<base::Time>();
+    i = crash_times_.find(path);
+  }
+  if (i->second.size() == kMaxCrashesPerInterval) {
+    i->second.erase(i->second.begin());
+  }
+  base::Time time = base::Time::Now();
+  i->second.push_back(time);
+}
+
+bool PluginServiceImpl::IsPluginUnstable(const FilePath& path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  std::map<FilePath, std::vector<base::Time> >::const_iterator i =
+      crash_times_.find(path);
+  if (i == crash_times_.end()) {
+    return false;
+  }
+  if (i->second.size() != kMaxCrashesPerInterval) {
+    return false;
+  }
+  base::TimeDelta delta = base::Time::Now() - i->second[0];
+  if (delta.InSeconds() <= kCrashesInterval) {
+    return true;
+  }
+  return false;
+}
+
 void PluginServiceImpl::RefreshPlugins() {
   plugin_list_->RefreshPlugins();
 }