Implement a bluetooth picker dialog for Android

content/public/browser/bluetooth_chooser.h

Index: content/public/browser/bluetooth_chooser.h
diff --git a/content/public/browser/bluetooth_chooser.h b/content/public/browser/bluetooth_chooser.h
index 07cd51ecff7d042ec918c70e8c4c8c366e82c9b9..9a9514a4dc403b921c8817329aaf9d64976dc401 100644
--- a/content/public/browser/bluetooth_chooser.h
+++ b/content/public/browser/bluetooth_chooser.h
@@ -10,6 +10,7 @@
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/web_contents.h"
 
 namespace content {
 
@@ -22,6 +23,14 @@ class CONTENT_EXPORT BluetoothChooser {
     CANCELLED,
     // The user selected device |opt_device_id|.
     SELECTED,
+    // The user asked for a new Bluetooth discovery session to start.
+    RESCAN,
+    // Show overview page for Bluetooth.
+    SHOW_OVERVIEW_HELP,
+    // Show help page explaining what Bluetooth pairing means.
+    SHOW_PAIRING_HELP,
+    // Show help page explaining why scanning failed because Bluetooth is off.
+    SHOW_ADAPTER_OFF_HELP,
 
     // As the dialog implementations grow more user-visible buttons and knobs,
     // we'll add enumerators here to support them.