Web MIDI: add RequestMIDISysExPermission to BrowserContext

android_webview/browser/aw_browser_context.h

Index: android_webview/browser/aw_browser_context.h
diff --git a/android_webview/browser/aw_browser_context.h b/android_webview/browser/aw_browser_context.h
index 4d672bc1b1e2cb624229a4a51a9260291f02f46d..33aa40973f1e8d33ea0f55234ee5c69cc85cde51 100644
--- a/android_webview/browser/aw_browser_context.h
+++ b/android_webview/browser/aw_browser_context.h
@@ -86,6 +86,11 @@ class AwBrowserContext : public content::BrowserContext,
   virtual net::URLRequestContextGetter*
       GetMediaRequestContextForStoragePartition(
           const base::FilePath& partition_path, bool in_memory) OVERRIDE;
+  virtual void RequestMIDISysExPermission(
+      int render_process_id,
+      int render_view_id,
+      const GURL& requesting_frame,
+      const MIDISysExPermissionCallback& callback) OVERRIDE;
   virtual content::ResourceContext* GetResourceContext() OVERRIDE;
   virtual content::DownloadManagerDelegate*
       GetDownloadManagerDelegate() OVERRIDE;