[CRD iOS] Add i18n strings for photo library and camera usage

remoting_localize.py only works if the string has been translated into
all supported languages. This CL adds strings for photo library and
camera usage into remoting_strings.grd in advance.

Bug: 821594
Change-Id: I9ee88f7cf65e07a872a91908b80ee17a391e0bae
Reviewed-on: https://chromium-review.googlesource.com/964805Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543488}

remoting/resources/remoting_strings.grd

@@ -644,6 +644,12 @@
         <message name="IDS_REPORT_THIS" desc="Label text for a button to report a connection failure to the developers.">
           Report this
         </message>
+        <message name="IDS_IOS_PHOTO_LIBRARY_USAGE_DESCRIPTION" desc="Message shown when the app requests permission to access the user's photo library.">
+          To choose a profile picture, allow Chrome Remote Desktop to access your photos
+        </message>
+        <message name="IDS_IOS_CAMERA_USAGE_DESCRIPTION" desc="Message shown when the app requests permission to use the camera of the device.">
+          To choose a profile picture, allow Chrome Remote Desktop to access your camera
+        </message>
 
 <!-- Play Store listings text. These Android-specific strings are not marked
      with formatter_data="android_java" since they are used only for the Play