Using StrictMode to detect activity leaks

Change-Id: I615f641897d57be0cd31be944796c6931ef9ab00

tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java

@@ -65,6 +65,7 @@ public class TaplTestsLauncher3 extends AbstractLauncherUiTest {
         test.waitForResumed("Launcher internal state is still Background");
         // Check that we switched to home.
         test.mLauncher.getWorkspace();
+        AbstractLauncherUiTest.checkDetectedLeaks();
     }
 
     // Please don't add negative test cases for methods that fail only after a long wait.