Add basic Chrome interaction with the mash shelf.

chrome/browser/ui/ash/ash_util.h

Index: chrome/browser/ui/ash/ash_util.h
diff --git a/chrome/browser/ui/ash/ash_util.h b/chrome/browser/ui/ash/ash_util.h
index 14dbb40827290b2d0d9575340017107caf0ac60d..87954d0b409b19ca4143badaf50249f98bbfdc53 100644
--- a/chrome/browser/ui/ash/ash_util.h
+++ b/chrome/browser/ui/ash/ash_util.h
@@ -16,6 +16,9 @@ namespace chrome {
 // Returns true if Ash should be run at startup.
 bool ShouldOpenAshOnStartup();
 
+// Returns true if Chrome is running in the mash shell.
+bool IsRunningInMash();
+
 // Returns true if |native_view/native_window| exists within the Ash
 // environment.
 bool IsNativeViewInAsh(gfx::NativeView native_view);