Add asset for "Close tab" action

This CL adds the asset used in the TabGrid popup menu action "Close
Tab".

Bug: 831152
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I8479a982ac8c280a33a036217b0688ac45b3ee0f
Reviewed-on: https://chromium-review.googlesource.com/1016908Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551667}

ios/chrome/browser/ui/popup_menu/BUILD.gn

@@ -63,6 +63,7 @@ source_set("popup_menu_ui") {
     "resources:popup_background",
     "resources:popup_menu_add_bookmark",
     "resources:popup_menu_bookmarks",
+    "resources:popup_menu_close_tab",
     "resources:popup_menu_find_in_page",
     "resources:popup_menu_help",
     "resources:popup_menu_history",

ios/chrome/browser/ui/popup_menu/popup_menu_mediator.mm

@@ -556,9 +556,9 @@ PopupMenuToolsItem* CreateTableViewItem(int titleID,
                          kToolsMenuCloseAllIncognitoTabsId)];
   }
 
-  [items addObject:CreateTableViewItem(IDS_IOS_TOOLS_MENU_CLOSE_TAB,
-                                       PopupMenuActionCloseTab, nil,
-                                       kToolsMenuCloseTabId)];
+  [items addObject:CreateTableViewItem(
+                       IDS_IOS_TOOLS_MENU_CLOSE_TAB, PopupMenuActionCloseTab,
+                       @"popup_menu_close_tab", kToolsMenuCloseTabId)];
 
   self.items = @[ items ];
 }

ios/chrome/browser/ui/popup_menu/resources/BUILD.gn

@@ -22,6 +22,15 @@ imageset("popup_menu_add_bookmark") {
   ]
 }
 
+imageset("popup_menu_close_tab") {
+  sources = [
+    "popup_menu_close_tab.imageset/Contents.json",
+    "popup_menu_close_tab.imageset/popup_menu_close_tab.png",
+    "popup_menu_close_tab.imageset/popup_menu_close_tab@2x.png",
+    "popup_menu_close_tab.imageset/popup_menu_close_tab@3x.png",
+  ]
+}
+
 imageset("popup_menu_site_information") {
   sources = [
     "popup_menu_site_information.imageset/Contents.json",

ios/chrome/browser/ui/popup_menu/resources/popup_menu_close_tab.imageset/Contents.json

+{
+    "images": [
+        {
+            "idiom": "universal",
+            "scale": "1x",
+            "filename": "popup_menu_close_tab.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "2x",
+            "filename": "popup_menu_close_tab@2x.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "3x",
+            "filename": "popup_menu_close_tab@3x.png"
+        }
+    ],
+    "info": {
+        "version": 1,
+        "author": "xcode"
+    }
+}