Mac: app mode loader (shim).

chrome/common/chrome_paths_mac.mm

Index: chrome/common/chrome_paths_mac.mm
diff --git a/chrome/common/chrome_paths_mac.mm b/chrome/common/chrome_paths_mac.mm
index 21868cdf7ae95b2a0f28cbaea47fc5178d207406..c7db483cdf8262ae141cc952de7c8c3998735b34 100644
--- a/chrome/common/chrome_paths_mac.mm
+++ b/chrome/common/chrome_paths_mac.mm
@@ -12,6 +12,10 @@
 #include "base/path_service.h"
 #include "chrome/common/chrome_constants.h"
 
+namespace {
+const FilePath* g_override_versioned_directory = NULL;
+}  // namespace
+
 namespace chrome {
 
 bool GetDefaultUserDataDirectory(FilePath* result) {
@@ -53,6 +57,9 @@ bool GetUserDesktop(FilePath* result) {
 }
 
 FilePath GetVersionedDirectory() {
+  if (g_override_versioned_directory)
+    return *g_override_versioned_directory;
+
   // Start out with the path to the running executable.
   FilePath path;
   PathService::Get(base::FILE_EXE, &path);
@@ -75,6 +82,13 @@ FilePath GetVersionedDirectory() {
   return path;
 }
 
+void SetOverrideVersionedDirectory(const FilePath* path) {
+  if (path != g_override_versioned_directory) {
+    delete g_override_versioned_directory;
+    g_override_versioned_directory = path;
+  }
+}
+
 FilePath GetFrameworkBundlePath() {
   // It's tempting to use +[NSBundle bundleWithIdentifier:], but it's really
   // slow (about 30ms on 10.5 and 10.6), despite Apple's documentation stating