chrome.audio API: treat mute as system wide property

extensions/test/data/api_test/audio/test.js

Index: extensions/test/data/api_test/audio/test.js
diff --git a/extensions/test/data/api_test/audio/test.js b/extensions/test/data/api_test/audio/test.js
index f79afa85b7cc6f14829ea09c20103d42b7eef670..14460e68c0220f0b0c0e1f62433002538ce76a18 100644
--- a/extensions/test/data/api_test/audio/test.js
+++ b/extensions/test/data/api_test/audio/test.js
@@ -161,11 +161,9 @@ chrome.test.runTests([
       var updatedOutput = expectedOutput['30001'];
       chrome.test.assertFalse(updatedOutput.isMuted);
       chrome.test.assertFalse(updatedOutput.volume === 35);
-      updatedOutput.isMuted = true;
       updatedOutput.volume = 35;
 
       chrome.audio.setProperties('30001', {
-        isMuted: true,
         volume: 35
       }, chrome.test.callbackPass(function() {
         chrome.audio.setProperties('40002', {
@@ -182,22 +180,51 @@ chrome.test.runTests([
     });
   },
 
+  function inputMuteTest() {
+    var getMute = function(callback) {
+      chrome.audio.getMute('INPUT', chrome.test.callbackPass(callback));
+    };
+    getMute(function(originalValue) {
+      chrome.audio.setMute('INPUT', !originalValue,
+          chrome.test.callbackPass(function() {
+            getMute(function(value) {
+              chrome.test.assertEq(!originalValue, value);
+            });
+          }));
+    });
+  },
+
+  function outputMuteTest() {
+    var getMute = function(callback) {
+      chrome.audio.getMute('OUTPUT', chrome.test.callbackPass(callback));
+    };
+    getMute(function(originalValue) {
+      chrome.audio.setMute('OUTPUT', !originalValue,
+          chrome.test.callbackPass(function() {
+            getMute(function(value) {
+              chrome.test.assertEq(!originalValue, value);
+            });
+          }));
+    });
+  },
+
   function setPropertiesInvalidValuesTest() {
     chrome.audio.getInfo(function(originalOutputInfo, originalInputInfo) {
       chrome.test.assertNoLastError();
       var expectedInput = deviceListToExpectedDevicesMap(originalInputInfo);
       var expectedOutput = deviceListToExpectedDevicesMap(originalOutputInfo);
+      var expectedError = 'Could not set volume/gain properties';
 
       chrome.audio.setProperties('30001', {
         isMuted: true,
         // Output device - should have volume set.
         gain: 55
-      }, chrome.test.callbackFail('Could not set properties', function() {
+      }, chrome.test.callbackFail(expectedError, function() {
         chrome.audio.setProperties('40002', {
           isMuted: true,
           // Input device - should have gain set.
           volume:55
-        }, chrome.test.callbackFail('Could not set properties', function() {
+        }, chrome.test.callbackFail(expectedError, function() {
           // Assert that device properties haven't changed.
           chrome.audio.getInfo(
               chrome.test.callbackPass(function(outputInfo, inputInfo) {