Adds emoji/handwriting/vocie buttons on opt-in IME menu.

ash/common/system/chromeos/ime_menu/ime_menu_tray.cc

Index: ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
diff --git a/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc b/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
index 4453ad526b30efb48793162702654a6623ea204a..d59b95c610e80057ad7e19147b8ccdd1d8282ca9 100644
--- a/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
+++ b/ash/common/system/chromeos/ime_menu/ime_menu_tray.cc
@@ -80,15 +80,27 @@ class ImeButtonsView : public views::View, public views::ButtonListener {
     SetLayoutManager(box_layout);
 
     if (show_emoji_button) {
-      // TODO(azurewei): Creates the proper button with icons.
+      emoji_button_ = CreateImeMenuButton(
+          this, IDR_AURA_UBER_TRAY_EMOJI, IDR_AURA_UBER_TRAY_EMOJI,
+          IDR_AURA_UBER_TRAY_EMOJI, IDR_AURA_UBER_TRAY_EMOJI,
+          IDS_ASH_STATUS_TRAY_EMOJI, IDS_ASH_STATUS_TRAY_EMOJI, 1);

[James Cook, 2016/08/23 16:01:22]

nit: Use a constant for 1, like const int right_border = 1;

[Azure Wei, 2016/09/18 05:40:02]

Removed this border.

+      AddChildView(emoji_button_);
     }
 
     if (show_voice_button) {
-      // TODO(azurewei): Creates the proper button with icons.
+      voice_button_ = CreateImeMenuButton(
+          this, IDR_AURA_UBER_TRAY_VOICE, IDR_AURA_UBER_TRAY_VOICE,
+          IDR_AURA_UBER_TRAY_VOICE, IDR_AURA_UBER_TRAY_VOICE,

[James Cook, 2016/08/23 16:01:22]

Should there be separate artwork for the disabled and hover states?

[Azure Wei, 2016/09/18 05:40:02]

Updated with vectorized icons instead of PNGs.

+          IDS_ASH_STATUS_TRAY_VOICE, IDS_ASH_STATUS_TRAY_VOICE, 1);
+      AddChildView(voice_button_);
     }
 
     if (show_handwriting_button) {
-      // TODO(azurewei): Creates the proper button with icons.
+      handwriting_button_ = CreateImeMenuButton(
+          this, IDR_AURA_UBER_TRAY_HANDWRITING, IDR_AURA_UBER_TRAY_HANDWRITING,
+          IDR_AURA_UBER_TRAY_HANDWRITING, IDR_AURA_UBER_TRAY_HANDWRITING,
+          IDS_ASH_STATUS_TRAY_HANDWRITING, IDS_ASH_STATUS_TRAY_HANDWRITING, 1);
+      AddChildView(handwriting_button_);
     }
 
     if (show_settings_button) {