Host Chrome OS GAIA signin page in webview

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 86a4e3354cd8aaa0d1d425cceef608f683cfe2bf..ac2a1e1d6bc6e1d4363045425c4ad184aeb08f83 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1919,6 +1919,11 @@ const char kConsumerManagementStage[] = "consumer_management.stage";
 
 // A boolean pref. If set to true, new experimental OOBE UI is displayed.
 const char kNewOobe[] = "NewOobe";
+
+// A boolean pref. If set to true, experimental webview based signin flow
+// activated.
+extern const char kWebviewSigninEnabled[] =
+    "webview_signin_enabled";
 #endif  // defined(OS_CHROMEOS)
 
 // Whether there is a Flash version installed that supports clearing LSO data.