Show Play Store rating and price in app list

ui/strings/ui_strings.grd

Index: ui/strings/ui_strings.grd
diff --git a/ui/strings/ui_strings.grd b/ui/strings/ui_strings.grd
index 344a6867e6bc61ed53a2eac046269fb00df041c3..c704b2881213d16b0d68f1d99d86c137490d46fe 100644
--- a/ui/strings/ui_strings.grd
+++ b/ui/strings/ui_strings.grd
@@ -696,6 +696,12 @@ need to be translated for each locale.-->
       <message name="IDS_APP_LIST_SPEECH_NETWORK_ERROR_HINT_TEXT" desc="The text label in the speech recognition UI to show the speech recognition can't start because of network error.">
         No internet connection
       </message>
+      <message name="IDS_APP_LIST_PRICE" desc="The text for the price of the play store app in the search results in the app launcher.">
+        $<ph name="price">{0}<ex>19.98</ex></ph>

[xiyuan, 2017/06/20 22:19:23]

Currency is tricky. Using "$" directly here is not i18n friendly.

Not sure what is the best way to get this. We have CurrencyFormatter [1] that
can do this. But I am not sure whether it is okay to have deps on it but you can
see how to use ICU to format currency.

[1]:
https://cs.chromium.org/chromium/src/components/payments/core/currency_format...

[weidongg, 2017/06/22 00:59:16]

I confirmed with the @hejq. The price should be formated string with currency
symbol. It seems that I don't need to worry about this. Thanks.

+      </message>
+      <message name="IDS_APP_LIST_RATING" desc="The text for the rating of the play store app in the search results in the app launcher.">
+        <ph name="rating">{0}<ex>4.5</ex></ph>★

[xiyuan, 2017/06/20 22:19:23]

Get rid of "*". Think it should be displayed via an image resource.

[weidongg, 2017/06/22 00:59:16]

I am confirming with UX designer about this. In the specs, the star seems to
have font which seems to indicate a text, but I am not sure.

+      </message>
 
       <!-- Strings describing the touch calibration UX -->
       <message name="IDS_DISPLAY_TOUCH_CALIBRATION_EXIT_LABEL" desc="A message to notify the user about using the escape key to exit the calibration mode.">