Enable immersive fullscreen for non-browser windows by default

ash/ash_switches.cc

Index: ash/ash_switches.cc
diff --git a/ash/ash_switches.cc b/ash/ash_switches.cc
index 6f369b6e444f888ebffc7459a27bc6f2ed94cf03..1e485ebbbe635ae81d603aed3ba7a84f8f47aeb1 100644
--- a/ash/ash_switches.cc
+++ b/ash/ash_switches.cc
@@ -108,6 +108,11 @@ const char kAshEnableBrightnessControl[] = "ash-enable-brightness-control";
 const char kAshEnableImmersiveFullscreenForAllWindows[] =
     "ash-enable-immersive-all-windows";
 
+// Enables putting only browser windows into immersive fullscreen via <F4>.
+// <F4> puts all other windows into non-immersive fullscreen.
+const char kAshEnableImmersiveFullscreenForBrowserOnly[] =
+    "ash-enable-immersive-browser-only";
+
 #if defined(OS_CHROMEOS)
 // Enables the "full multi profile mode" - as it was in M-31.
 const char kAshEnableFullMultiProfileMode[] =
@@ -221,6 +226,11 @@ bool UseDragOffShelf() {
       HasSwitch(kAshDisableDragOffShelf);
 }
 
+bool UseImmersiveFullscreenForAllWindows() {
+  return !CommandLine::ForCurrentProcess()->HasSwitch(
+      kAshEnableImmersiveFullscreenForBrowserOnly);
+}
+
 bool ShowShelfAlignmentMenu() {
   return !CommandLine::ForCurrentProcess()->
       HasSwitch(kHideShelfAlignmentMenu);