Added flag for alternate launcher settings (remaining changes to come).

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index ab46df475b15ae03e376d25714905d856a5b1407..d6b9a53b3b794726e3f3d291c7af530a1098ce0f 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -120,6 +120,14 @@ const char kAshSecondaryDisplayLayout[] = "ash-secondary-display-layout";
 // Enables the heads-up display for tracking touch points.
 const char kAshTouchHud[] = "ash-touch-hud";
 
+// Use alternate layout of the shelf for testing a new look and feel:
+// Slightly smaller profile, only 2 states for the "bar highlight" on
+// launcher buttons, app list icon with more visible state indication,
+// app list icon repositionable and defaulting as 1st item in shelf,
+// more visible state indication for background on status area.
+// crbug's [244983, 244990, 244994, 245005, 245012]
+const char kAshUseAlternateShelfLayout[] = "ash-use-alternate-shelf";
+
 // Uses the 1st display in --ash-host-window-bounds as internal display.
 // This is for debugging on linux desktop.
 const char kAshUseFirstDisplayAsInternal[] =
@@ -157,5 +165,10 @@ bool ShowAudioDeviceMenu() {
           HasSwitch(ash::switches::kAshEnableAudioDeviceMenu);
 }
 
+bool UseAlternateShelfLayout() {
+  return CommandLine::ForCurrentProcess()->
+        HasSwitch(ash::switches::kAshUseAlternateShelfLayout);
+}
+
 }  // namespace switches
 }  // namespace ash