[Hotword] Add error message display back in. Add error messages for NaCl. Add metrics for errors.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 3c2a32658e74a12fe7c7dad11bc50fb997cbf494..2c4978afffe04744a16010b4185fa0244a70bbc1 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6671,12 +6671,21 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_HOTWORD_CONFIRM_BUBBLE_DISABLE" desc="The button text that disallows the hotword voice search trigger.">
         Cancel
       </message>
-      <message name="IDS_HOTWORD_RETRY_DOWNLOAD_BUTTON" desc="The button text that retries a failed hotword setup in the settings page.">
-        Retry
+      <message name="IDS_HOTWORD_GENERIC_ERROR_MESSAGE" desc="The default error message text when no additional details are known.">
+        This feature is temporarily unavailable.
+      </message>
+      <message name="IDS_HOTWORD_NACL_DISABLED_ERROR_MESSAGE" desc="The error message text when hotwording fails because NaCl is disabled.">
+        <ph name="BEGIN_LINK">&lt;a target="_blank" href="chrome://plugins"&gt;</ph>Native Client plug-in<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph> needs to be enabled to use this feature.
+      </message>
+      <message name="IDS_HOTWORD_MICROPHONE_ERROR_MESSAGE" desc="The error message text when hotwording fails because the microphone isn't working.">
+        Mircophone is currently unavailable. <ph name="BEGIN_LINK">&lt;a target="_blank" href="chrome://settings/content#media-stream-settings"&gt;</ph>Manage microphone<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
       </message>
       <message name="IDS_HOTWORD_AUDIO_LOGGING_ENABLE" desc="A checkbox in the hotword confirm dialog that allows for sending audio of 'Ok, Google' plus a few seconds before back to Google to improve voice search.">
         Improve voice search by sending the sound of "Ok Google," and a few seconds before, to Google.
       </message>
+      <message name="IDS_HOTWORD_HELP_LINK" desc="Text that provides a link to the help center troubleshooting page.">
+        <ph name="BEGIN_LINK">&lt;a target="_blank" href="$1"&gt;</ph>Help<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
+      </message>
 
       <if expr="is_win">
         <!-- Conflicts page -->