linux: expose the ProcessSingleton timeout to speed tests

chrome/browser/process_singleton.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PROCESS_SINGLETON_H_
 #define CHROME_BROWSER_PROCESS_SINGLETON_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 22 matching lines @@
  public:
   enum NotifyResult {
     PROCESS_NONE,
     PROCESS_NOTIFIED,
     PROFILE_IN_USE,
   };
 
   explicit ProcessSingleton(const FilePath& user_data_dir);
   ~ProcessSingleton();
 
+  // Notify another process, if available.
   // Returns true if another process was found and notified, false if we
   // should continue with this process.
   // Windows code roughly based on Mozilla.
   //
   // TODO(brettw): this will not handle all cases. If two process start up too
   // close to each other, the Create() might not yet have happened for the
   // first one, so this function won't find it.
   NotifyResult NotifyOtherProcess();
 
+#if defined(OS_LINUX)
+  // Exposed for testing.  We use a timeout on Linux, and in tests we want
+  // this timeout to be short.
+  NotifyResult NotifyOtherProcessWithTimeout(int timeout_seconds);
+#endif
+
   // Sets ourself up as the singleton instance.
   void Create();
 
   // Clear any lock state during shutdown.
   void Cleanup();
 
   // Blocks the dispatch of CopyData messages. foreground_window refers
   // to the window that should be set to the foreground if a CopyData message
   // is received while the ProcessSingleton is locked.
   void Lock(gfx::NativeWindow foreground_window) {
@@ skipping 54 matching lines @@
   // Helper class for linux specific messages.  LinuxWatcher is ref counted
   // because it posts messages between threads.
   class LinuxWatcher;
   scoped_refptr<LinuxWatcher> watcher_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
 };
 
 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_H_