Add flag to enable web content to invoke web intents.

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 fa2cfb4bc2e05e823bdabf6e3cc797479e6eef9a..03a10668cb2835fa7e6d9aec8d49aa885072aa74 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1330,6 +1330,10 @@ const char kVisitURLs[]                     = "visit-urls";
 const char kWebIntentsNativeServicesEnabled[] =
     "web-intents-native-services-enabled";
 
+// Enable invocation of web intents from web content.
+const char kWebIntentsInvocationEnabled[] =
+    "enable-web-intents-invocation";
+
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[]        = "whitelisted-extension-id";