Zen a11y: Add a blurb re: screen readers to total silence.

Bug: 21640568
Change-Id: Ia1278844270d157f8bd9f0e853e4e7296e025aef
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index c026d77..3e70e80 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -772,6 +772,9 @@
     <!-- Shows when people have clicked on the camera icon [CHAR LIMIT=60] -->
     <string name="camera_hint">Swipe from icon for camera</string>
 
+    <!-- Accessibility content description for Interruption level: None. [CHAR LIMIT=NONE] -->
+    <string name="interruption_level_none_with_warning">Total silence.  This will also silence screen readers.</string>
+
     <!-- Interruption level: None. [CHAR LIMIT=40] -->
     <string name="interruption_level_none">Total silence</string>
 
diff --git a/packages/SystemUI/src/com/android/systemui/volume/ZenModePanel.java b/packages/SystemUI/src/com/android/systemui/volume/ZenModePanel.java
index 92c508e..0bacfda 100644
--- a/packages/SystemUI/src/com/android/systemui/volume/ZenModePanel.java
+++ b/packages/SystemUI/src/com/android/systemui/volume/ZenModePanel.java
@@ -151,7 +151,7 @@
 
         mZenButtons = (SegmentedButtons) findViewById(R.id.zen_buttons);
         mZenButtons.addButton(R.string.interruption_level_none_twoline,
-                R.string.interruption_level_none,
+                R.string.interruption_level_none_with_warning,
                 Global.ZEN_MODE_NO_INTERRUPTIONS);
         mZenButtons.addButton(R.string.interruption_level_alarms_twoline,
                 R.string.interruption_level_alarms,