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

components/test_runner/test_runner.h

Index: components/test_runner/test_runner.h
diff --git a/components/test_runner/test_runner.h b/components/test_runner/test_runner.h
index 6b389b1417476b7ef7be9f020e0de8596547a4f9..b8f6284c647c9fc115f4e31938a89e6d1ab6f870 100644
--- a/components/test_runner/test_runner.h
+++ b/components/test_runner/test_runner.h
@@ -521,9 +521,25 @@ class TestRunner : public WebTestRunner,
   void SetColorProfile(const std::string& name,
                        v8::Local<v8::Function> callback);
 
-  // Change the bluetooth test data while running a layout test.
+  // Change the bluetooth test data while running a layout test and resets the
+  // chooser to accept the first device.
   void SetBluetoothMockDataSet(const std::string& name);
 
+  // Makes the Bluetooth chooser record its input and wait for instructions from
+  // the test program on how to proceed.
+  void SetBluetoothManualChooser();
+
+  // Returns the events recorded since the last call to this function.
+  std::vector<std::string> GetBluetoothManualChooserEvents();
+
+  // Calls the BluetoothChooser::EventHandler with the arguments here. Valid
+  // event strings are:
+  //  * "cancel" - simulates the user canceling the chooser.
+  //  * "select" - simulates the user selecting a device whose device ID is in
+  //               |argument|.
+  void SendBluetoothManualChooserEvent(const std::string& event,
+                                       const std::string& argument);
+
   // Enables mock geofencing service while running a layout test.
   // |service_available| indicates if the mock service should mock geofencing
   // being available or not.