Detect new instance of the browser when running in the background in persiste...

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
===================================================================
--- chrome/browser/browser_main.cc	(revision 45984)
+++ chrome/browser/browser_main.cc	(working copy)
@@ -618,6 +618,19 @@
 
 }  // namespace
 
+#if defined(OS_WIN)
+#define DLLEXPORT __declspec(dllexport)
+
+// We use extern C for the prototype DLLEXPORT to avoid C++ name mangling.
+extern "C" {
+DLLEXPORT void __cdecl RelaunchChromeBrowserWithNewCommandLineIfNeeded();
+}
+
+DLLEXPORT void __cdecl RelaunchChromeBrowserWithNewCommandLineIfNeeded() {
+  Upgrade::RelaunchChromeBrowserWithNewCommandLineIfNeeded();
+}
+#endif
+
 // Main routine for running as the Browser process.
 int BrowserMain(const MainFunctionParams& parameters) {
   const CommandLine& parsed_command_line = parameters.command_line_;
@@ -1177,7 +1190,7 @@
     // the main message loop.
     if (browser_init.Start(parsed_command_line, std::wstring(), profile,
                            &result_code)) {
-#if defined(OS_WIN)
+#if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
       // Initialize autoupdate timer. Timer callback costs basically nothing
       // when browser is not in persistent mode, so it's OK to let it ride on
       // the main thread. This needs to be done here because we don't want
@@ -1185,6 +1198,14 @@
       g_browser_process->StartAutoupdateTimer();
 #endif
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+      // On Linux, the running exe will be updated if an upgrade becomes
+      // available while the browser is running.  We need to save the last
+      // modified time of the exe, so we can compare to determine if there is
+      // an upgrade while the browser is kept alive by a persistent extension.
+      Upgrade::SaveLastModifiedTimeOfExe();
+#endif
+
       // Record now as the last succesful chrome start.
       GoogleUpdateSettings::SetLastRunTime();
       // Call Recycle() here as late as possible, before going into the loop