[MD Settings] Add feature to enable md-settings by default.

chrome/browser/browser_about_handler.cc

Index: chrome/browser/browser_about_handler.cc
diff --git a/chrome/browser/browser_about_handler.cc b/chrome/browser/browser_about_handler.cc
index 04274b19630444720285912579e02d40cfcc37a8..93c73b9d18cf6f8f660831086b836f1a521071f6 100644
--- a/chrome/browser/browser_about_handler.cc
+++ b/chrome/browser/browser_about_handler.cc
@@ -88,20 +88,26 @@ bool WillHandleBrowserAboutURL(GURL* url,
       path = chrome::kChromeUIHistoryHost + url->path();
 #endif
     }
-  // Redirect chrome://settings
+  // Redirect chrome://settings, unless MD settings is enabled.
   } else if (host == chrome::kChromeUISettingsHost) {
     if (::switches::AboutInSettingsEnabled()) {

[Nico, 2016/06/10 18:41:27]

this looks a bit funny -- if i enable md settings but also about-in-settings, i
don't get md settings?

[groby-ooo-7-16, 2016/06/10 20:58:17]

The two flags are mutually exclusive, so any combination is "undefined behavior"
;)

(about-in-settings happens in the old settings page, md-settings is an entirely
new settings page)

       host = chrome::kChromeUISettingsFrameHost;
+    } else if (base::FeatureList::IsEnabled(
+                   features::kMaterialDesignSettingsFeature)) {
+      return true;  // Prevent further rewriting - this is a valid URL.
     } else {
       host = chrome::kChromeUIUberHost;
       path = chrome::kChromeUISettingsHost + url->path();
     }
-  // Redirect chrome://help
+  // Redirect chrome://help, unless MD settings is enabled.
   } else if (host == chrome::kChromeUIHelpHost) {
     if (::switches::AboutInSettingsEnabled()) {
       host = chrome::kChromeUISettingsFrameHost;
       if (url->path().empty() || url->path() == "/")
         path = chrome::kChromeUIHelpHost;
+    } else if (base::FeatureList::IsEnabled(
+                   features::kMaterialDesignSettingsFeature)) {
+      return true;  // Prevent further rewriting - this is a valid URL.
     } else {
       host = chrome::kChromeUIUberHost;
       path = chrome::kChromeUIHelpHost + url->path();