Send Chrome's process id to the app shim.

chrome/common/mac/app_mode_common.h

Index: chrome/common/mac/app_mode_common.h
diff --git a/chrome/common/mac/app_mode_common.h b/chrome/common/mac/app_mode_common.h
index d397c4b3c590aee399052bda51b761b9afa8d66e..de82e2450d33b2b74646edde0f16e0ef937ed86c 100644
--- a/chrome/common/mac/app_mode_common.h
+++ b/chrome/common/mac/app_mode_common.h
@@ -29,9 +29,10 @@ extern const char kAppShimSocketName[];
 // Special app mode id used for the App Launcher.
 extern const char kAppListModeId[];
 
-// Instructs the app shim to send LaunchApp with launch_now = false. This
-// associates the shim without launching the app.
-extern const char kNoLaunchApp[];
+// The process ID of the Chrome process that launched the app shim.
+// The presence of this switch instructs the app shim to send LaunchApp with
+// launch_now = false. This associates the shim without launching the app.
+extern const char kLaunchedByChromeProcessId[];
 
 // The display name of the bundle as shown in Finder and the Dock. For localized
 // bundles, this overrides the bundle's file name.