Make getBluetoothManualChooserEvents() asynchronous.

content/shell/renderer/layout_test/blink_test_runner.h

Index: content/shell/renderer/layout_test/blink_test_runner.h
diff --git a/content/shell/renderer/layout_test/blink_test_runner.h b/content/shell/renderer/layout_test/blink_test_runner.h
index a4b07ceaf9fb09b145319674ae18c5143086218d..6739bedac2059a731b49264dea7b2f3fe1c3978c 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.h
+++ b/content/shell/renderer/layout_test/blink_test_runner.h
@@ -5,8 +5,10 @@
 #ifndef CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 #define CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 
+#include <deque>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/test_runner/test_preferences.h"
@@ -97,7 +99,9 @@ class BlinkTestRunner : public RenderViewObserver,
   void SetDeviceColorProfile(const std::string& name) override;
   void SetBluetoothMockDataSet(const std::string& name) override;
   void SetBluetoothManualChooser() override;
-  std::vector<std::string> GetBluetoothManualChooserEvents() override;
+  void GetBluetoothManualChooserEvents(
+      const base::Callback<void(const std::vector<std::string>&)>& callback)
+      override;
   void SendBluetoothManualChooserEvent(const std::string& event,
                                        const std::string& argument) override;
   void SetGeofencingMockProvider(bool service_available) override;
@@ -158,6 +162,8 @@ class BlinkTestRunner : public RenderViewObserver,
   void OnReset();
   void OnNotifyDone();
   void OnTryLeakDetection();
+  void OnReplyBluetoothManualChooserEvents(
+      const std::vector<std::string>& events);
 
   // After finishing the test, retrieves the audio, text, and pixel dumps from
   // the TestRunner library and sends them to the browser process.
@@ -177,6 +183,9 @@ class BlinkTestRunner : public RenderViewObserver,
   std::vector<std::vector<PageState> > session_histories_;
   std::vector<unsigned> current_entry_indexes_;
 
+  std::deque<base::Callback<void(const std::vector<std::string>&)>>
+      get_bluetooth_events_callbacks_;
+
   bool is_main_window_;
 
   bool focus_on_next_commit_;