[Mac] Adds Emoji context menu icon in MacViews.

This change adds an emoji icon to be shown along with the menu text.
https://screenshot.googleplex.com/LO3aKXYwaqc.

For more details, see http://go/chrome-emojisertion.

Bug: 827404

Change-Id: I2b480a7a60ca92ceeb042bdc347ebb5441fd71f7
Reviewed-on: https://chromium-review.googlesource.com/1010978
Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#550507}(cherry picked from commit 5824f15)
Reviewed-on: https://chromium-review.googlesource.com/1014203
Cr-Commit-Position: refs/branch-heads/3396@{#57}
Cr-Branched-From: 9ef2aa8-refs/heads/master@{#550428}

Author: Ramya Nagarajan

ui/views/controls/views_text_services_context_menu_mac.mm

@@ -10,9 +10,11 @@
 #include "ui/base/cocoa/text_services_context_menu.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/simple_menu_model.h"
+#include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_features.h"
 #include "ui/gfx/decorated_text.h"
 #import "ui/gfx/decorated_text_mac.h"
+#include "ui/resources/grit/ui_resources.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/view.h"
@@ -42,8 +44,11 @@
       menu->InsertSeparatorAt(index++, ui::NORMAL_SEPARATOR);
     }
     if (base::FeatureList::IsEnabled(features::kEnableEmojiContextMenu)) {
-      menu->InsertItemWithStringIdAt(index++, IDS_CONTENT_CONTEXT_EMOJI,
+      menu->InsertItemWithStringIdAt(index, IDS_CONTENT_CONTEXT_EMOJI,
                                      IDS_CONTENT_CONTEXT_EMOJI);
+      menu->SetIcon(index++,
+                    ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+                        IDR_EMOJI_FAVICON));
       menu->InsertSeparatorAt(index++, ui::NORMAL_SEPARATOR);
     }
     text_services_menu_.AppendToContextMenu(menu);