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..00590a4cd0ee17c48e40702c4f28b8319c575c66 100644
--- a/chrome/browser/metrics/thread_watcher.cc
+++ b/chrome/browser/metrics/thread_watcher.cc
@@ -539,6 +539,13 @@ void ThreadWatcherList::InitializeAndStartWatching(
   ThreadWatcherList* thread_watcher_list = new ThreadWatcherList();
   CHECK(thread_watcher_list);
 
+  // Disable ThreadWatcher in Canary channel.
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+  if (channel == chrome::VersionInfo::CHANNEL_CANARY ||
+      channel == chrome::VersionInfo::CHANNEL_UNKNOWN) {
+    return;
+  }
+
   const base::TimeDelta kSleepTime =
       base::TimeDelta::FromSeconds(kSleepSeconds);
   const base::TimeDelta kUnresponsiveTime =