Add article link to play promises rejection error message

third_party/WebKit/LayoutTests/media/media-play-promise.html

Index: third_party/WebKit/LayoutTests/media/media-play-promise.html
diff --git a/third_party/WebKit/LayoutTests/media/media-play-promise.html b/third_party/WebKit/LayoutTests/media/media-play-promise.html
index d83ff1e10f2b967f8fcaa27fa62580ad3a378396..e70ef77a6dd8eed3979f793388c12580f11c075e 100644
--- a/third_party/WebKit/LayoutTests/media/media-play-promise.html
+++ b/third_party/WebKit/LayoutTests/media/media-play-promise.html
@@ -296,14 +296,14 @@ var tests = [
         audio.play().then(t.unreached_func(), t.step_func(function(e) {
             assert_equals(e.name, 'AbortError');
             assert_equals(e.message,
-                'The play() request was interrupted by a call to pause().');
+                'The play() request was interrupted by a call to pause(). https://goo.gl/LdLk22');
             firstPromiseRejected = true;
         }));
 
         audio.play().then(t.unreached_func(), t.step_func_done(function(e) {
             assert_equals(e.name, 'AbortError');
             assert_equals(e.message,
-                'The play() request was interrupted by a call to pause().');
+                'The play() request was interrupted by a call to pause(). https://goo.gl/LdLk22');
             assert_true(firstPromiseRejected);
         }));