MD History: Add icon in top right of page when showing synced results

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 47757dd76a61a179961544285c986e9d42802d52..345e8dd936cedc7d16820ab8ee718dac6ed76f54 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -464,6 +464,12 @@ are declared in build/common.gypi.
       <message name="IDS_MD_HISTORY_ITEMS_SELECTED" desc="Label displayed in history toolbar telling the user how many items they have selected.">
         <ph name="NUMBER_OF_ITEMS_SELECTED">$1</ph> selected
       </message>
+      <message name="IDS_MD_HISTORY_HAS_SYNCED_RESULTS" desc="The notification at the top of the history page indicating that it is showing visits synced from other devices.">
+        Showing history from your signed-in devices. <ph name="BEGIN_LINK">&lt;a href="https://support.google.com/chrome/?p=sync_history&amp;hl=[GRITLANGCODE]"&gt;</ph>Learn more<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
+      </message>
+      <message name="IDS_MD_HISTORY_HAS_SYNCED_RESULTS_DESCRIPTION" desc="Description for the notification at the top of the history page indicating that it is showing visits synced from other devices. This is spoken by the screen reader when the notification button is focused.">
+        Showing history from your signed-in devices.
+      </message>
       <message name="IDS_MD_HISTORY_HISTORY_MENU_DESCRIPTION" desc="Tooltip for the history sidebar menu button.">
         Main menu
       </message>