[Sync] Port about:sync to DOMUI

chrome/common/url_constants.h

Index: chrome/common/url_constants.h
diff --git a/chrome/common/url_constants.h b/chrome/common/url_constants.h
index 532f23074b0f2a3fbefdd72da208b51bd6be8564..145d799e81faca93257b9e4fd9df1c68e6f080b6 100644
--- a/chrome/common/url_constants.h
+++ b/chrome/common/url_constants.h
@@ -57,6 +57,8 @@ extern const char kAboutMemoryURL[];
 extern const char kAboutNetInternalsURL[];
 extern const char kAboutPluginsURL[];
 extern const char kAboutShorthangURL[];
+extern const char kAboutSyncURL[];
+extern const char kAboutSyncInternalsURL[];
 extern const char kAboutTermsURL[];
 extern const char kAboutVaporwareURL[];
 extern const char kAboutVersionURL[];
@@ -123,6 +125,7 @@ extern const char kChromeUIRemotingResourcesHost[];
 extern const char kChromeUIResourcesHost[];
 extern const char kChromeUIScreenshotPath[];
 extern const char kChromeUISettingsHost[];
+extern const char kChromeUISyncInternalsHost[];
 extern const char kChromeUISyncResourcesHost[];
 extern const char kChromeUITextfieldsHost[];
 extern const char kChromeUIThemePath[];
@@ -160,6 +163,9 @@ extern const char kCloudPrintSetupHost[];
 extern const char kNetworkViewCacheURL[];
 extern const char kNetworkViewInternalsURL[];
 
+// Sync related URLs.
+extern const char kSyncViewInternalsURL[];
+
 // GPU related URLs
 extern const char kGpuInternalsURL[];