[WebUI] Add a chrome://prefs-internals page

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index 03d8ff3f37acab890adfa982e2b42bc4b0e9cb25..42c0754f054f771d9758e823c6960d7a34a2003a 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -75,6 +75,7 @@
 #include "chrome/browser/ssl/chrome_ssl_host_state_delegate.h"
 #include "chrome/browser/ssl/chrome_ssl_host_state_delegate_factory.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
+#include "chrome/browser/ui/webui/prefs_internals_source.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_paths_internal.h"
@@ -507,6 +508,8 @@ ProfileImpl::ProfileImpl(
     // Prefs were loaded synchronously so we can continue directly.
     OnPrefsLoaded(create_mode, true);
   }
+
+  content::URLDataSource::Add(this, new PrefsInternalsSource(this));

[Devlin, 2017/03/01 17:59:23]

Any better place for this?

[Dan Beam, 2017/03/08 18:40:58]

i don't really know but in an ideal world this wouldn't be instantiated until
the URL is requested, but it also doesn't seem to be very heavy

[Devlin, 2017/03/09 01:21:49]

Agreed - does the webui framework offer a way to do that for data sources?  (It
does for full-blown webui hosts, but I haven't seen a way to do it for this.)

[Dan Beam, 2017/03/09 02:16:54]

not really

 }
 
 void ProfileImpl::DoFinalInit() {