mac gcapi: Add LaunchGoogleChrome() function.

chrome/installer/gcapi_mac/gcapi.mm

 // Copyright (c) 2012 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.
 
 #include "chrome/installer/gcapi_mac/gcapi.h"
 
 #import <Cocoa/Cocoa.h>
 #include <sys/utsname.h>
 
 namespace {
@@ skipping 104 matching lines @@
     local_reasons |= GCCC_ERROR_USERLEVELALREADYPRESENT;
 
   [pool drain];
 
   // Done. Copy/return results.
   if (reasons != NULL)
     *reasons = local_reasons;
 
   return local_reasons == 0;
 }
+
+int LaunchGoogleChrome() {
+  @autoreleasepool {

[Mark Mentovai, 2012/05/18 19:15:06]

You used an explicit NSAutoreleasePool in GoogleChromeCompatibilityCheck, but
@autoreleasepool here. Does @autoreleasepool work as far back as 10.5 at
runtime?

[Nico, 2012/05/18 19:21:24]

In GCCC, @autoreleasepool would indent the whole function and it doesn't help
much. Here I'd have to add a `int result = ` variable so that i can drain before
returning, so it's more useful in this function.
As far as I understand, @autoreleasepool is just compiled into normal
NSAutoreleasePool calls when building without -fobjc-arc. I checked that a
simple test program using @autoreleasepool runs fine on 10.5. (arc does need
some support functions, but i believe those are statically linked into the
resulting binary, so even with arc it should run fine on 10.5. I haven't checked
that part though.)

+    return [[NSWorkspace sharedWorkspace]
+        launchApplication:@"/Applications/Google Chrome.app"];
+  }
+}