Add functions to let tests read and control the Bluetooth chooser state.

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 f1b45a6935fb2ba764cb014c2faec9d44b738553..3a589d582ce5df44c26862b5d46e8f90816a4cc1 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.h
+++ b/content/shell/renderer/layout_test/blink_test_runner.h
@@ -96,6 +96,10 @@ class BlinkTestRunner : public RenderViewObserver,
   void SetDeviceScaleFactor(float factor) override;
   void SetDeviceColorProfile(const std::string& name) override;
   void SetBluetoothMockDataSet(const std::string& name) override;
+  void SetBluetoothManualChooser() override;
+  std::vector<std::string> GetBluetoothManualChooserEvents() override;
+  void SendBluetoothManualChooserEvent(const std::string& event,
+                                       const std::string& argument) override;
   void SetGeofencingMockProvider(bool service_available) override;
   void ClearGeofencingMockProvider() override;
   void SetGeofencingMockPosition(double latitude, double longitude) override;