Disable ThreadWatcher in CANARY and UNKNOWN channels temporarily to measure its

chrome/browser/metrics/thread_watcher.cc

Index: chrome/browser/metrics/thread_watcher.cc
diff --git a/chrome/browser/metrics/thread_watcher.cc b/chrome/browser/metrics/thread_watcher.cc
index 27dc82511b812a8aba1a8eeee256932a98c611d3..45802aaf0628e98ad0866e5a90cef16f3576ca0e 100644
--- a/chrome/browser/metrics/thread_watcher.cc
+++ b/chrome/browser/metrics/thread_watcher.cc
@@ -536,6 +536,12 @@ void ThreadWatcherList::InitializeAndStartWatching(
   if (g_thread_watcher_list_ || g_stopped_)
     return;
 
+  // Disable ThreadWatcher in Canary channel.
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel == chrome::VersionInfo::CHANNEL_CANARY ||
+      channel == chrome::VersionInfo::CHANNEL_UNKNOWN)

[Alexei Svitkine (slow), 2015/04/28 16:38:38]

Nit: {}'s

[ramant (doing other things), 2015/04/28 17:06:35]

Done.

+    return;
+
   ThreadWatcherList* thread_watcher_list = new ThreadWatcherList();
   CHECK(thread_watcher_list);