Add sign in dialog for GCP->print preview integration.

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 cbaa36a1e9946783f6ed241aea685f94c4e39c48..ab95aa8e7ff0902781e24fd0c4364c4dc9c0a7e9 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1349,9 +1349,16 @@ const char kRemoteAccessHostFirewallTraversal[] =
 // The root URL of the cloud print service.
 const char kCloudPrintServiceURL[] = "cloud_print.service_url";
 
+// The URL to use to sign in to cloud print.
+const char kCloudPrintSigninURL[] = "cloud_print.signin_url";
+
 // The last requested size of the dialog as it was closed.
 const char kCloudPrintDialogWidth[] = "cloud_print.dialog_size.width";
 const char kCloudPrintDialogHeight[] = "cloud_print.dialog_size.height";
+const char kCloudPrintSigninDialogWidth[] =
+    "cloud_print.signin_dialog_size.width";
+const char kCloudPrintSigninDialogHeight[] =
+    "cloud_print.signin_dialog_size.height";
 
 // The list of BackgroundContents that should be loaded when the browser
 // launches.