Implement two new policies to control muting the audio I/O.

chrome/app/policy/policy_templates.json

Index: chrome/app/policy/policy_templates.json
diff --git a/chrome/app/policy/policy_templates.json b/chrome/app/policy/policy_templates.json
index e224c72ab14a8bf681950baf0124e4ef64354c95..e25ecaef0cb61767dd0a76219a121dcb673c65f6 100644
--- a/chrome/app/policy/policy_templates.json
+++ b/chrome/app/policy/policy_templates.json
@@ -112,7 +112,7 @@
 #   persistent IDs for all fields (but not for groups!) are needed. These are
 #   specified by the 'id' keys of each policy. NEVER CHANGE EXISTING IDs,
 #   because doing so would break the deployed wire format!
-#   For your editing convenience: highest ID currently used: 158
+#   For your editing convenience: highest ID currently used: 160
 #
 # Placeholders:
 #   The following placeholder strings are automatically substituted:
@@ -3149,6 +3149,40 @@
       If this setting is disabled or not configured then users can use all supported types of external storage on their device.''',
     },
     {
+      'name': 'AudioOutputDisabled',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome_os:0.23-'],
+      'features': {'dynamic_refresh': True},
+      'example_value': True,
+      'id': 159,
+      'caption': '''Disable playing audio on the device''',
+      'desc': '''Disable playing audio on the device.
+
+      When this policy is set to true, audio output will not be available on the device.

[Mattias Nissler (ping if slow), 2012/08/28 12:24:24]

I thought this is a user policy now?

[pastarmovj, 2012/08/28 15:11:50]

Yes it is just the wording is not very good. It still is the device that won't
play sounds but only while the user session is active. I have tuned the wording
accordingly.

+
+      This policy affects all types of audio output and not only the built-in speakers. Audio accessability features are also inhibited by this policy. Do not enable this policy if screen reader is required for this device.
+
+      If this setting is disabled or not configured then users can use all supported audio outputs on their device.''',
+    },
+    {
+      'name': 'AudioCaptureDisabled',
+      'type': 'main',
+      'schema': { 'type': 'boolean' },
+      'supported_on': ['chrome_os:0.23-'],
+      'features': {'dynamic_refresh': True},
+      'example_value': True,
+      'id': 160,
+      'caption': '''Disable capturing audio on the device''',
+      'desc': '''Disable capturing audio on the device.
+
+      When this policy is set to true, audio capturing will not be available on the device.

[Mattias Nissler (ping if slow), 2012/08/28 12:24:24]

ditto

[pastarmovj, 2012/08/28 15:11:50]

Done.

+
+      This policy affects all types of audio inputs and not only the built-in microphone.
+
+      If this setting is disabled or not configured then users can use all supported microphones on their device.''',

[Mattias Nissler (ping if slow), 2012/08/28 12:24:24]

s/microphones/audio inputs/

[pastarmovj, 2012/08/28 15:11:50]

Done.

+    },
+    {
       'name': 'DisableScreenshots',
       'type': 'main',
       'schema': { 'type': 'boolean' },