Add chrome://nfc-debug for debugging NFC on Chrome OS.

chrome/common/url_constants.cc

Index: chrome/common/url_constants.cc
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index 9a2619424eaf09db922688a848a0af31cd6c0225..c6b4531ebb2e31268295e1d8e3920eabf04aea03 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -110,6 +110,7 @@ const char kChromeUIKeyboardOverlayURL[] = "chrome://keyboardoverlay/";
 const char kChromeUILockScreenURL[] = "chrome://lock/";
 const char kChromeUIMediaplayerURL[] = "chrome://mediaplayer/";
 const char kChromeUIMobileSetupURL[] = "chrome://mobilesetup/";
+const char kChromeUINfcDebugURL[] = "chrome://nfc-debug/";
 const char kChromeUIOobeURL[] = "chrome://oobe/";
 const char kChromeUIOSCreditsURL[] = "chrome://os-credits/";
 const char kChromeUIProxySettingsURL[] = "chrome://proxy-settings/";
@@ -263,6 +264,7 @@ const char kChromeUILoginContainerHost[] = "login-container";
 const char kChromeUILoginHost[] = "login";
 const char kChromeUIMediaplayerHost[] = "mediaplayer";
 const char kChromeUIMobileSetupHost[] = "mobilesetup";
+const char kChromeUINfcDebugHost[] = "nfc-debug";
 const char kChromeUINetworkHost[] = "network";
 const char kChromeUIOobeHost[] = "oobe";
 const char kChromeUIOSCreditsHost[] = "os-credits";