Generate TTS_EVENT_PAUSE and TTS_EVENT_RESUME events for web tests

This CL generates TTS_EVENT_PAUSE and TTS_EVENT_RESUME in
WebTestTtsPlatform to get events in web tests.
It modifies 'restriction-speech-synthesis.html' to test pause()
and resume() in prerendering.

Bug: 1365948
Change-Id: Ic9491a14c4343e88bb197db062bf4dfee2bd212e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3981368
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Evan Liu <evliu@google.com>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1067415}

content/web_test/browser/web_test_tts_platform.cc

@@ -34,6 +34,7 @@ void WebTestTtsPlatform::Speak(
     OnSpeakFinishedCallback on_speak_finished) {
   content::TtsController* controller = content::TtsController::GetInstance();
   int len = static_cast<int>(utterance.size());
+  utterance_id_ = utterance_id;
   controller->OnTtsEvent(utterance_id, content::TTS_EVENT_START, 0, len,
                          std::string());
   base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
@@ -46,6 +47,7 @@ void WebTestTtsPlatform::SimulateEndEvent(
     int utterance_id,
     int len,
     OnSpeakFinishedCallback on_speak_finished) {
+  utterance_id_ = kInvalidUtteranceId;
   std::move(on_speak_finished).Run(true);
   content::TtsController* controller = content::TtsController::GetInstance();
   controller->OnTtsEvent(utterance_id, content::TTS_EVENT_END, len, 0,
@@ -63,9 +65,17 @@ bool WebTestTtsPlatform::IsSpeaking() {
 void WebTestTtsPlatform::GetVoices(
     std::vector<content::VoiceData>* out_voices) {}
 
-void WebTestTtsPlatform::Pause() {}
+void WebTestTtsPlatform::Pause() {
+  content::TtsController* controller = content::TtsController::GetInstance();
+  controller->OnTtsEvent(utterance_id_, content::TTS_EVENT_PAUSE, 0, 0,
+                         std::string());
+}
 
-void WebTestTtsPlatform::Resume() {}
+void WebTestTtsPlatform::Resume() {
+  content::TtsController* controller = content::TtsController::GetInstance();
+  controller->OnTtsEvent(utterance_id_, content::TTS_EVENT_RESUME, 0, 0,
+                         std::string());
+}
 
 void WebTestTtsPlatform::WillSpeakUtteranceWithVoice(
     content::TtsUtterance* utterance,

content/web_test/browser/web_test_tts_platform.h

@@ -47,12 +47,16 @@ class WebTestTtsPlatform : public content::TtsPlatform {
   content::ExternalPlatformDelegate* GetExternalPlatformDelegate() override;
 
  private:
+  static const int kInvalidUtteranceId = -1;
+
   WebTestTtsPlatform();
   virtual ~WebTestTtsPlatform();
   void SimulateEndEvent(int utterance_id,
                         int len,
                         OnSpeakFinishedCallback on_speak_finished);
 
+  int utterance_id_ = kInvalidUtteranceId;
+
   friend struct base::DefaultSingletonTraits<WebTestTtsPlatform>;
 };
 

third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/speech-synthesis.https.html

@@ -41,6 +41,23 @@
         speechSynthesis.cancel();
         break;
       }
+      case 'pause': {
+        const utter = new SpeechSynthesisUtterance('1');
+        utter.onpause = () => { resolve(); }
+        speechSynthesis.speak(utter);
+        speechSynthesis.pause();
+        // To reset the current status for the next test, it calls cancel().
+        speechSynthesis.cancel();
+        break;
+      }
+      case 'resume': {
+        const utter = new SpeechSynthesisUtterance('1');
+        utter.onresume = () => { resolve(); }
+        speechSynthesis.speak(utter);
+        speechSynthesis.pause();
+        speechSynthesis.resume();
+        break;
+      }
     }
   });
   prerenderEventCollector.start(promise, `speechSynthesis.${method}`);

third_party/blink/web_tests/external/wpt/speculation-rules/prerender/restriction-speech-synthesis.html

@@ -55,5 +55,7 @@
 
 RunTest('speak', `speechSynthesis.speak(utterance) should be deferred until the prerendered page is activated`);
 RunTest('cancel', `speechSynthesis.cancel() should be deferred until the prerendered page is activated`);
+RunTest('pause', `speechSynthesis.pause() should be deferred until the prerendered page is activated`);
+RunTest('resume', `speechSynthesis.resume() should be deferred until the prerendered page is activated`);
 </script>
 </body>