[MD Feedback] Add basic chrome://feedback WebUI.

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 68c305a5fa22b8f034dd301808f1542a45ea4761..60a1624b595aa9790564c15101d30d7895180117 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -49,6 +49,7 @@ const char kChromeUIExtensionsFrameURL[] = "chrome://extensions-frame/";
 const char kChromeUIExtensionsURL[] = "chrome://extensions/";
 const char kChromeUIFallbackIconURL[] = "chrome://fallback-icon/";
 const char kChromeUIFaviconURL[] = "chrome://favicon/";
+const char kChromeUIFeedbackURL[] = "chrome://feedback/";
 const char kChromeUIFlagsURL[] = "chrome://flags/";
 const char kChromeUIFlashURL[] = "chrome://flash/";
 const char kChromeUIGCMInternalsURL[] = "chrome://gcm-internals/";
@@ -190,6 +191,7 @@ const char kChromeUIExtensionsFrameHost[] = "extensions-frame";
 const char kChromeUIExtensionsHost[] = "extensions";
 const char kChromeUIFallbackIconHost[] = "fallback-icon";
 const char kChromeUIFaviconHost[] = "favicon";
+const char kChromeUIFeedbackHost[] = "feedback";
 const char kChromeUIFlagsHost[] = "flags";
 const char kChromeUIFlashHost[] = "flash";
 const char kChromeUIGCMInternalsHost[] = "gcm-internals";