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 40dfa42f9167a8c729b11392479122001a107b05..561452b848e2eb309a9144e22539bbb8b1767227 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1328,6 +1328,10 @@ const char kVisitURLs[]                     = "visit-urls";
 const char kWebIntentsNativeServicesEnabled[] =
     "web-intents-native-services-enabled";
 
+// Enable invocation of web intents from web content.
+const char kWebIntentsEnabledForWebContent[] =
+    "web-intents-enabled-for-web-content";
+
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[]        = "whitelisted-extension-id";