Add chrome://slow for enabling performance tracing for feedback reports.

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 e005bea4bedd22b383d61adf9d6d6823155da0b8..5f1c7a096c5cb0656dfd4e554e29da679b1aff23 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -109,6 +109,7 @@ const char kChromeUIOSCreditsURL[] = "chrome://os-credits/";
 const char kChromeUIProxySettingsURL[] = "chrome://proxy-settings/";
 const char kChromeUISimUnlockURL[] = "chrome://sim-unlock/";
 const char kChromeUISlideshowURL[] = "chrome://slideshow/";
+const char kChromeUISlowURL[] = "chrome://slow/";
 const char kChromeUISystemInfoURL[] = "chrome://system/";
 const char kChromeUITermsOemURL[] = "chrome://terms/oem";
 const char kChromeUIUserImageURL[] = "chrome://userimage/";
@@ -262,6 +263,7 @@ const char kChromeUIProxySettingsHost[] = "proxy-settings";
 const char kChromeUIRotateHost[] = "rotate";
 const char kChromeUISimUnlockHost[] = "sim-unlock";
 const char kChromeUISlideshowHost[] = "slideshow";
+const char kChromeUISlowHost[] = "slow";
 const char kChromeUISystemInfoHost[] = "system";
 const char kChromeUIUserImageHost[] = "userimage";