Convert the async device ID getter to a chrome resource host

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 33e216c941b683bd33109936dd66c7cd838f0331..7766f55d418683d958e06c2b3fe93e286e2d258c 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -54,6 +54,7 @@ class AccessTokenStore;
 class BrowserChildProcessHost;
 class BrowserContext;
 class BrowserMainParts;
+class BrowserPpapiHost;
 class BrowserURLHandler;
 class MediaObserver;
 class QuotaPermissionContext;
@@ -434,6 +435,11 @@ class CONTENT_EXPORT ContentBrowserClient {
   // else we should do with the file.
   virtual std::string GetDefaultDownloadName();
 
+  // Notifification that a pepper plugin has just been spawned. This allows the
+  // embedder to add filters onto the host to implement interfaces.
+  // This is called on the IO thread.
+  virtual void DidCreatePpapiPlugin(BrowserPpapiHost* browser_host) {}
+
   // Returns true if renderer processes can use Pepper TCP/UDP sockets from
   // the given origin.
   virtual bool AllowPepperSocketAPI(BrowserContext* browser_context,