Adding instrument to NotificationRegistrar to check

Add() and Remove() are called from same thread.

Note I already checked in a fix for the bug. The CL
is trying to check whether the issue exists in other
code path.

TEST=none
BUG=27834

Review URL: http://codereview.chromium.org/449044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33802 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 11 insertions, 0 deletions

diff --git a/chrome/browser/chrome_thread.cc b/chrome/browser/chrome_thread.cc
index f279ed3..a5cbe89 100644
--- a/chrome/browser/chrome_thread.cc
+++ b/chrome/browser/chrome_thread.cc
@@ -59,6 +59,13 @@ ChromeThread::~ChromeThread() {
 }
 
 // static
+bool ChromeThread::IsWellKnownThread(ID identifier) {
+  AutoLock lock(lock_);
+  return (identifier >= 0 && identifier < ID_COUNT &&
+          chrome_threads_[identifier]);
+}
+
+// static
 bool ChromeThread::CurrentlyOn(ID identifier) {
   AutoLock lock(lock_);
   DCHECK(identifier >= 0 && identifier < ID_COUNT);
diff --git a/chrome/browser/chrome_thread.h b/chrome/browser/chrome_thread.h
index e890790..a8fe44b 100644
--- a/chrome/browser/chrome_thread.h
+++ b/chrome/browser/chrome_thread.h
@@ -114,6 +114,10 @@ class ChromeThread : public base::Thread {
         identifier, from_here, new ReleaseTask<T>(object));
   }
 
+  // Callable on any thread.  Returns whether the given ID corresponds to a well
+  // known thread.
+  static bool IsWellKnownThread(ID identifier);
+
   // Callable on any thread.  Returns whether you're currently on a particular
   // thread.
   static bool CurrentlyOn(ID identifier);