Pref service: create service at browser startup

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 4dd626e7914dd439ed863765d9a955c1fc54f611..90ca1a3cc5cb8791d6069f6e46438e3670e369aa 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -685,6 +685,11 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Manager.
   virtual void RegisterInProcessServices(StaticServiceMap* services) {}
 
+  // Registers per-browser-context services to be loaded in the browser process
+  // by the Service Manager.
+  virtual void RegisterInProcessServices(BrowserContext* browser_context,

[jam, 2017/03/07 21:41:02]

generally we put stuff in ContentBrowserClient as a last resort, when there's no
other more specific delegate interface. In this case, the method should go on
BrowserContext (i.e. after all the Create* methods there)

[tibell, 2017/03/08 00:05:52]

Done.

+                                         StaticServiceMap* services) {}
+
   using OutOfProcessServiceMap = std::map<std::string, base::string16>;
 
   // Registers services to be loaded out of the browser process, in a sandboxed