Test app launcher registration in test_installer rather than InstallationValidator.

chrome/test/mini_installer/config/chrome_system_installed.prop

 {
   "Files": {
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\chrome.exe": {"exists": true},
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome.dll":
         {"exists": true},
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome_elf.dll":
         {"exists": true},
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\chrome.7z":
         {"exists": true},
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe":
         {"exists": true},
     "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\$MINI_INSTALLER_FILE_VERSION.manifest":
         {"exists": true}
   },
   "RegistryEntries": {
     "HKEY_LOCAL_MACHINE\\$CHROME_UPDATE_REGISTRY_SUBKEY": {
       "exists": "required",
       "values": {
         "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
       }
     },
     "HKEY_LOCAL_MACHINE\\$BINARIES_UPDATE_REGISTRY_SUBKEY": {
       "exists": "required",
       "values": {
         "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
       }
     },
+    "HKEY_LOCAL_MACHINE\\$LAUNCHER_UPDATE_REGISTRY_SUBKEY": {
+      "condition": "$SUPPORTS_SXS",

[gab, 2015/04/08 14:28:29]

This is testing only under SxS while the old code was testing only when NOT
under SxS?

Why is the app launcher even SxS dependent?

[grt (UTC plus 2), 2015/04/08 14:35:40]

Not quite. This is testing non-SxS Chrome when SxS is supported (i.e., this is
Google Chrome rather than Chromium). The chrome_canary_*.prop files are for SxS
Chrome.
Neither Chromium (where SxS is not supported) nor SxS Chrome (canary) track
usage of the app launcher by this appguid.

[gab, 2015/04/08 15:00:58]

I see, so this has nothing to do with SxS really... Can we introduce something
like $SUPPORTS_APP_LAUNCHER or even more generic $IS_GOOGLE_CHROME? Feels like
relying on $SUPPORTS_SXS here is just a hack depending on a correlation between
two mostly independent logical elements.

[grt (UTC plus 2), 2015/04/08 15:11:10]

Good point. I've made it conditional on Google Chrome, testing by name. Whaddya
think?

+      "exists": "required",
+      "values": {
+        "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
+      }
+    },
     "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\$CHROME_LONG_NAME": {
       "exists": "required",
       "values": {
         "UninstallString": {
           "type": "SZ",
           "data": "\"$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe\" --uninstall --multi-install --chrome --system-level --verbose-logging"
         },
         "Version": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
       }
     },
     "HKEY_LOCAL_MACHINE\\Software\\Classes\\$CHROME_SHORT_NAME": {
       "condition": "$WINDOWS_VERSION >= $VERSION_WIN8",
       "exists": "required"
     }
   }
 }