Defer app window appearance until first paint.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index a75946f03e6aa53a7297736a4d76b489f6d685c2..c4c1b862c848541e7976582be8d1452946465c3d 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -544,6 +544,11 @@ const char kEnableAdviewSrcAttribute[]      = "enable-adview-src-attribute";
 // Enables the <window-controls> tag in platform apps.
 const char kEnableAppWindowControls[]       = "enable-app-window-controls";
 
+// Show apps windows after the first paint. Windows will be shown significantly
+// later for heavy apps loading resources synchronously but it will be
+// insignificant for apps that load most of their resources asynchronously.
+const char kEnableAppsShowOnFirstPaint[]    = "enable-apps-show-on-first-paint";
+
 // Enables the experimental asynchronous DNS client.
 const char kEnableAsyncDns[]                = "enable-async-dns";