Add GetAnyChromeSxSPath.

chrome/installer/launcher_support/chrome_launcher_support.cc

Index: chrome/installer/launcher_support/chrome_launcher_support.cc
diff --git a/chrome/installer/launcher_support/chrome_launcher_support.cc b/chrome/installer/launcher_support/chrome_launcher_support.cc
index c28bf9977fe403abb101b0da3718902fee2798b4..458b42b668d447c86bad5f7649508ec5cae3ee54 100644
--- a/chrome/installer/launcher_support/chrome_launcher_support.cc
+++ b/chrome/installer/launcher_support/chrome_launcher_support.cc
@@ -34,6 +34,7 @@ const wchar_t kAppHostAppId[] = L"{FDA71E6F-AC4C-4a00-8B70-9958A68906BF}";
 
 // Copied from chrome_appid.cc.
 const wchar_t kBinariesAppGuid[] = L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}";
+const wchar_t kSxSBrowserAppGuid[] = L"{4ea16ac7-fd5a-47c3-875b-dbf4a2008c20}";
 
 // Copied from google_chrome_distribution.cc.
 const wchar_t kBrowserAppGuid[] = L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
@@ -42,6 +43,7 @@ const wchar_t kBrowserAppGuid[] = L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
 const wchar_t kChromeAppHostExe[] = L"app_host.exe";
 const char kChromeAppLauncher[] = "app-launcher";
 const wchar_t kChromeExe[] = L"chrome.exe";
+const char kChromeSxS[] = "chrome-sxs";
 const wchar_t kUninstallArgumentsField[] = L"UninstallArguments";
 const wchar_t kUninstallStringField[] = L"UninstallString";
 
@@ -150,6 +152,9 @@ void UninstallLegacyAppLauncher(InstallationLevel level) {
 }
 
 base::FilePath GetSetupExeForInstallationLevel(InstallationLevel level) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(kChromeSxS))

[grt (UTC plus 2), 2014/03/17 21:26:51]

from what context do you expect to call this? do callers necessarily have
--chrome-sxs on their command line?

+    return GetSetupExeFromRegistry(level, kSxSBrowserAppGuid);
+
   // Look in the registry for Chrome Binaries first.
   base::FilePath setup_exe_path(
       GetSetupExeFromRegistry(level, kBinariesAppGuid));