Add UMA for --app-shim-error.

chrome/app/app_mode_loader_mac.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.
 
 // On Mac, shortcuts can't have command-line arguments. Instead, produce small
 // app bundles which locate the Chromium framework and load it, passing the
 // appropriate data. This is the code for such an app bundle. It should be kept
 // minimal and do as little work as possible (with as much work done on
 // framework side as possible).
 
@@ skipping 122 matching lines @@
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           app_mode::kLaunchedByChromeProcessId) ||
       info->app_mode_id == app_mode::kAppListModeId) {
     // Pass --app-shim-error to have Chrome rebuild this shim.
     // If Chrome has rebuilt this shim once already, then rebuilding doesn't fix
     // the problem, so don't try again.
     if (!CommandLine::ForCurrentProcess()->HasSwitch(
             app_mode::kLaunchedAfterRebuild)) {
       command_line.AppendSwitchPath(app_mode::kAppShimError,
                                     app_mode_bundle_path);
+#if defined(ARCH_CPU_32_BITS)

[tapted, 2014/06/26 06:47:05]

I have a hunch this will never be false again on mac.. But I could be wrong

[jackhou1, 2014/06/27 04:55:56]

I don't think it hurts to differentiate this. If it turns out to be useless we
can remove it.

+      command_line.AppendSwitchASCII(app_mode::kAppShimErrorDetail,
+                                     app_mode::kAppShimErrorDetail32Bit);
+#elif defined(ARCH_CPU_64_BITS)
+      command_line.AppendSwitchASCII(app_mode::kAppShimErrorDetail,
+                                     app_mode::kAppShimErrorDetail64Bit);
+#endif
     }
   } else {
     // If the shim was launched directly (instead of by Chrome), first ask
     // Chrome to launch the app. Chrome will launch the shim again, the same
     // error will occur and be handled above. This approach allows the app to be
     // started without blocking on fixing the shim and guarantees that the
     // profile is loaded when Chrome receives --app-shim-error.
     command_line.AppendSwitchPath(switches::kProfileDirectory,
                                   info->profile_dir);
     command_line.AppendSwitchASCII(switches::kAppId, info->app_mode_id);
@@ skipping 20 matching lines @@
   // Hard coded info parameters.
   info.major_version = app_mode::kCurrentChromeAppModeInfoMajorVersion;
   info.minor_version = app_mode::kCurrentChromeAppModeInfoMinorVersion;
   info.argc = argc;
   info.argv = argv;
 
   // Exit instead of returning to avoid the the removal of |main()| from stack
   // backtraces under tail call optimization.
   exit(LoadFrameworkAndStart(&info));
 }