Create tests to ensure notification delegation works!

Previously when attempting to write tests I had issues starting TestTrustedWebActivityService (a subclass of TrustedWebActivityService) that was in ../../chrome/android/javatests/src/org/chromium/chrome/browser/browserservices/TestTrustedWebActivityService.java.

I think this was due to some strangeness with classes in different apks. Error:

java.lang.RuntimeException: Unable to instantiate service android.support.customtabs.trusted.TrustedWebActivityService:
java.lang.ClassNotFoundException: Didn't find class "android.support.customtabs.trusted.TrustedWebActivityService" on path: DexPathList[[
           zip file "/system/framework/android.test.mock.jar",
           zip file "/system/framework/org.apache.http.legacy.boot.jar",
           zip file "/system/framework/android.test.runner.jar",
           zip file "/data/app/org.chromium.chrome.tests-32eE3ouaLKR3ADOqH_EGCw==/base.apk"
         ],
         nativeLibraryDirectories=[
           /data/app/org.chromium.chrome.tests-32eE3ouaLKR3ADOqH_EGCw==/lib/arm64,
           /system/lib64
         ]
       ]                                                          
       at android.app.ActivityThread.handleCreateService(ActivityThread.java:3479)
       at android.app.ActivityThread.access$1200(ActivityThread.java:197)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1627)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:164)                 
       at android.app.ActivityThread.main(ActivityThread.java:6591)
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.customtabs.trusted.TrustedWebActivityService" on path: DexPathList[[
           zip file "/system/framework/android.test.mock.jar",
           zip file "/system/framework/org.apache.http.legacy.boot.jar",
           zip file "/system/framework/android.test.runner.jar",
           zip file "/data/app/org.chromium.chrome.tests-32eE3ouaLKR3ADOqH_EGCw==/base.apk"
         ],
         nativeLibraryDirectories=[
           /data/app/org.chromium.chrome.tests-32eE3ouaLKR3ADOqH_EGCw==/lib/arm64,
           /system/lib64
         ]
       ]
       at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:379) 
       at java.lang.ClassLoader.loadClass(ClassLoader.java:312) 
       at android.app.AppComponentFactory.instantiateServicAppComponentFactory.java:103)
       at android.app.ActivityThread.handleCreateService(ActivityThread.java:3474)