Fix TTS instantiation from webview accessibility handlers.

The TTS instantiated from here shouldn't clobber any
existing TTS objects opened within the same package context.

Ideally, the TTS API should work fine with multiple TTS object
instances within the same package context but making that happen
correctly is a larger change.

bug:5659758
Change-Id: Ia1f63c61b9f12ac92ff42a427a004d414e42a759

Author: narayank

core/java/android/speech/tts/TextToSpeech.java

@@ -490,6 +490,7 @@ public class Engine {
     private final Map<String, Uri> mUtterances;
     private final Bundle mParams = new Bundle();
     private final TtsEngines mEnginesHelper;
+    private final String mPackageName;
     private volatile String mCurrentEngine = null;
 
     /**
@@ -518,19 +519,36 @@ public TextToSpeech(Context context, OnInitListener listener) {
      * @param engine Package name of the TTS engine to use.
      */
     public TextToSpeech(Context context, OnInitListener listener, String engine) {
+        this(context, listener, engine, null);
+    }
+
+    /**
+     * Used by the framework to instantiate TextToSpeech objects with a supplied
+     * package name, instead of using {@link android.content.Context#getPackageName()}
+     *
+     * @hide
+     */
+    public TextToSpeech(Context context, OnInitListener listener, String engine,
+            String packageName) {
         mContext = context;
         mInitListener = listener;
         mRequestedEngine = engine;
 
         mEarcons = new HashMap<String, Uri>();
         mUtterances = new HashMap<String, Uri>();
+        mUtteranceProgressListener = null;
 
         mEnginesHelper = new TtsEngines(mContext);
+        if (packageName != null) {
+            mPackageName = packageName;
+        } else {
+            mPackageName = mContext.getPackageName();
+        }
         initTts();
     }
 
     private String getPackageName() {
-        return mContext.getPackageName();
+        return mPackageName;
     }
 
     private <R> R runActionNoReconnect(Action<R> action, R errorResult, String method) {

core/java/android/speech/tts/TextToSpeechService.java

@@ -450,23 +450,23 @@ public void stop() {
         @Override
         public void dispatchOnDone() {
             final String utteranceId = getUtteranceId();
-            if (!TextUtils.isEmpty(utteranceId)) {
+            if (utteranceId != null) {
                 mCallbacks.dispatchOnDone(getCallingApp(), utteranceId);
             }
         }
 
         @Override
         public void dispatchOnStart() {
             final String utteranceId = getUtteranceId();
-            if (!TextUtils.isEmpty(utteranceId)) {
+            if (utteranceId != null) {
                 mCallbacks.dispatchOnStart(getCallingApp(), utteranceId);
             }
         }
 
         @Override
         public void dispatchOnError() {
             final String utteranceId = getUtteranceId();
-            if (!TextUtils.isEmpty(utteranceId)) {
+            if (utteranceId != null) {
                 mCallbacks.dispatchOnError(getCallingApp(), utteranceId);
             }
         }

core/java/android/webkit/WebView.java

@@ -1306,8 +1306,15 @@ private void addAccessibilityApisToJavaScript() {
         if (AccessibilityManager.getInstance(mContext).isEnabled()
                 && getSettings().getJavaScriptEnabled()) {
             // exposing the TTS for now ...
-            mTextToSpeech = new TextToSpeech(getContext(), null);
-            addJavascriptInterface(mTextToSpeech, ALIAS_ACCESSIBILITY_JS_INTERFACE);
+            final Context ctx = getContext();
+            if (ctx != null) {
+                final String packageName = ctx.getPackageName();
+                if (packageName != null) {
+                    mTextToSpeech = new TextToSpeech(getContext(), null, null,
+                            packageName + ".**webview**");
+                    addJavascriptInterface(mTextToSpeech, ALIAS_ACCESSIBILITY_JS_INTERFACE);
+                }
+            }
         }
     }