Upstream WebAPK notification related code

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 cddfdc5f59259afc115b91cb1ea9f501014a052d..a5f1812feb17676407bcfd787b92dfee8b4ea4bb 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -557,6 +557,14 @@ const char kEnableUserAlternateProtocolPorts[] =
 // apps).
 const char kEnableWebAppFrame[] = "enable-web-app-frame";
 
+#if defined(OS_ANDROID)
+// Enables "Add to Home screen" in the app menu to generate WebAPKs. WebAPKs are
+// app-like home screen shortcuts.
+// - WebAPKs show up in the app list.
+// - Chrome supports deep linking to WebAPKs.

[Peter Beverloo, 2016/05/19 15:59:01]

With my command-line-switches-lister[1]-hat on, do lines 563 and 564 add value
to this explanation? This probably isn't the place to explain how WebAPKs differ
from Add to Homescreen ;)

[1] http://peter.sh/experiments/chromium-command-line-switches/

[pkotwicz, 2016/05/20 00:45:19]

You are right there are better places to document what WebAPKs do. Probably a
README file in chrome/android/webapk

I have been aware of the "command line switch list" web page for many years and
I have used it a lot. I think I got to know about it one or two weeks after I
started on the Chrome team. Thank you for maintaining the web page.

+const char kEnableWebApk[] = "enable-webapk";
+#endif
+
 // Enables Web Notification custom layouts.
 const char kEnableWebNotificationCustomLayouts[] =
     "enable-web-notification-custom-layouts";