Add sample extensions that use the text-to-speech (TTS) API.

chrome/common/extensions/docs/examples/extensions/speak_selection/background.js

Index: chrome/common/extensions/docs/examples/extensions/speak_selection/background.js
===================================================================
--- chrome/common/extensions/docs/examples/extensions/speak_selection/background.js	(revision 0)
+++ chrome/common/extensions/docs/examples/extensions/speak_selection/background.js	(revision 0)
@@ -0,0 +1,77 @@
+var lastUtterance = '';
+var speaking = false;
+var globalUtteranceIndex = 0;
+
+if (localStorage['lastVersionUsed'] != '1') {
+  localStorage['lastVersionUsed'] = '1';
+  chrome.tabs.create({
+    url: chrome.extension.getURL('options.html')
+  });
+}
+
+function speak(utterance) {
+  if (speaking && utterance == lastUtterance) {
+    chrome.tts.stop();
+    return;
+  }
+
+  speaking = true;
+  lastUtterance = utterance;
+  globalUtteranceIndex++;
+  var utteranceIndex = globalUtteranceIndex;
+
+  chrome.browserAction.setIcon({path: 'SpeakSel19-active.png'});
+
+  var rate = localStorage['rate'] || 1.0;
+  var pitch = localStorage['pitch'] || 1.0;
+  var volume = localStorage['volume'] || 1.0;
+  var voice = localStorage['voice'];
+  chrome.tts.speak(
+      utterance,
+      {voiceName: voice,
+       rate: parseFloat(rate),
+       pitch: parseFloat(pitch),
+       volume: parseFloat(volume),
+       onEvent: function(evt) {
+         if (evt.type == 'end' ||
+             evt.type == 'interrupted' ||
+             evt.type == 'cancelled' ||
+             evt.type == 'error') {
+           if (utteranceIndex == globalUtteranceIndex) {
+             speaking = false;
+             chrome.browserAction.setIcon({path: 'SpeakSel19.png'});
+           }
+         }
+       }
+      });
+}
+
+function initBackground() {
+  loadContentScriptInAllTabs();
+
+  var defaultKeyString = getDefaultKeyString();
+  var keyString = localStorage['speakKey'];
+  if (keyString == undefined) {
+    keyString = defaultKeyString;
+    localStorage['speakKey'] = keyString;
+  }
+  sendKeyToAllTabs(keyString);
+
+  chrome.extension.onRequest.addListener(
+      function(request, sender, sendResponse) {
+        if (request['init']) {
+          sendResponse({'key': localStorage['speakKey']});
+        } else if (request['speak']) {
+          speak(request['speak']);
+        }
+      });
+
+  chrome.browserAction.onClicked.addListener(
+      function(tab) {
+        chrome.tabs.sendRequest(
+            tab.id,
+            {'speakSelection': true});
+      });
+}
+
+initBackground();
Property changes on: chrome/common/extensions/docs/examples/extensions/speak_selection/background.js
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Added: svn:eol-style
   + LF