Add test for ProcessSingleton hung rendezvous case.

chrome/browser/chrome_process_finder_win.cc

Index: chrome/browser/chrome_process_finder_win.cc
diff --git a/chrome/browser/chrome_process_finder_win.cc b/chrome/browser/chrome_process_finder_win.cc
index 0fe88448bf3ee569a5c537c083d398d2e500d7d5..bbb9c71c76f8f0de494592823fac85e9bfb95cb3 100644
--- a/chrome/browser/chrome_process_finder_win.cc
+++ b/chrome/browser/chrome_process_finder_win.cc
@@ -28,7 +28,9 @@
 
 namespace {
 
-const int kTimeoutInSeconds = 20;
+const int kDefaultTimeoutInSeconds = 20;
+
+int timeout_in_seconds = kDefaultTimeoutInSeconds;
 
 // The following is copied from net/base/escape.cc. We don't want to depend on
 // net here because this gets compiled into chrome.exe to facilitate
@@ -146,7 +148,7 @@ NotifyChromeResult AttemptToNotifyRunningChrome(HWND remote_window,
                            NULL,
                            reinterpret_cast<LPARAM>(&cds),
                            SMTO_ABORTIFHUNG,
-                           kTimeoutInSeconds * 1000,
+                           timeout_in_seconds * 1000,
                            &result)) {
     return result ? NOTIFY_SUCCESS : NOTIFY_FAILED;
   }
@@ -159,4 +161,10 @@ NotifyChromeResult AttemptToNotifyRunningChrome(HWND remote_window,
   return NOTIFY_WINDOW_HUNG;
 }
 
+int SetNotificationTimeoutForTesting(int new_timeout) {
+  int old_timeout = timeout_in_seconds;
+  timeout_in_seconds = new_timeout;
+  return old_timeout;
+}
+
 }  // namespace chrome