app_shell: Add audio and video capture support

extensions/extensions_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <!--
   Strings for the extensions module. Used mostly for low-level error messages.
   Where possible new strings should be kept in Chrome and the extensions module
   should return an error code, message flag, etc.
 -->
 
 <grit latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
@@ skipping 202 matching lines @@
       <message name="IDS_EXTENSION_PROMPT_WARNING_HOST_AND_SUBDOMAIN_LIST" desc="Single entry permission string requesting access to data on a website and its sub-domains.">
         All <ph name="WEBSITE_1">$1<ex>google.com</ex></ph> sites
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_HOSTS_LIST" desc="Permission string for access to data for an arbitrary list of websites.">
         Read and change your data on a number of websites
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_HOST_LIST_ENTRY" desc="Single entry in a list of websites.">
         - <ph name="WEBSITE_1">$1<ex>www.google.com</ex></ph>
       </message>
 
+      <!-- Media capture permissions. Please keep alphabetized. -->
+      <message name="IDS_EXTENSION_PROMPT_WARNING_AUDIO_CAPTURE" desc="Permission string for access to audio capture devices.">
+        Use your microphone
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_VIDEO_CAPTURE" desc="Permission string for access to video capture devices.">
+        Use your camera
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_AUDIO_AND_VIDEO_CAPTURE" desc="Permission string for access to both audio and video capture devices.">
+        Use your microphone and camera
+      </message>
+
       <!-- Media galleries strings. Please keep alphabetized. -->
       <message name="IDS_EXTENSION_PROMPT_WARNING_MEDIA_GALLERIES_READ" desc="Permission string for access to read all of the user's media galleries.">
         Access photos, music, and other media from your computer
       </message>
 
       <!-- Policy strings. Please keep alphabetized. -->
       <message name="IDS_EXTENSION_CANT_INSTALL_POLICY_BLOCKED" desc="Error message when a user tries to install an extension that is blocked by administrator policy.">
         <ph name="EXTENSION_NAME">$1<ex>Google Talk</ex></ph> (extension ID "<ph name="EXTENSION_ID">$2<ex>nckgahadagoaajjgafhacjanaoiihapd</ex></ph>") is blocked by the administrator.
       </message>
       <message name="IDS_EXTENSION_CANT_MODIFY_POLICY_REQUIRED" desc="Error message when a user tries to remove or change an extension that is required by administrator policy.">
@@ skipping 47 matching lines @@
       <message name="IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_MISSING_PRODUCT" desc="Permission string for access to a specific USB device when a product name cannot be established for a USB device.">
         Access the USB device from <ph name="VENDOR_NAME">$1<ex>Griffin Technology</ex></ph>
       </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_USB_DEVICE_MISSING_VENDOR" desc="Permission string for access to a specific USB device when a vendor name cannot be established for a USB device.">
         Access the USB device
       </message>
 
     </messages>
   </release>
 </grit>