[chromeos] Add an about:power UI.

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 3139e6047ff97b8bebed02d8dbad6b6dbacc4849..2ed3e1f19b5b2f826f8e168b3af46309835b40ba 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -266,6 +266,7 @@ const char kChromeUIMobileSetupHost[] = "mobilesetup";
 const char kChromeUINetworkHost[] = "network";
 const char kChromeUIOobeHost[] = "oobe";
 const char kChromeUIOSCreditsHost[] = "os-credits";
+const char kChromeUIPowerHost[] = "power";
 const char kChromeUIProxySettingsHost[] = "proxy-settings";
 const char kChromeUIRotateHost[] = "rotate";
 const char kChromeUIScreenlockIconHost[] = "screenlock-icon";
@@ -597,6 +598,7 @@ const char* const kChromeHostURLs[] = {
   kChromeUINetworkHost,
   kChromeUIOobeHost,
   kChromeUIOSCreditsHost,
+  kChromeUIPowerHost,
   kChromeUIProxySettingsHost,
   kChromeUITaskManagerHost,
 #endif