Add action for each button on opt-in IME menu.

ui/base/ime/chromeos/input_method_manager.h

Index: ui/base/ime/chromeos/input_method_manager.h
diff --git a/ui/base/ime/chromeos/input_method_manager.h b/ui/base/ime/chromeos/input_method_manager.h
index 448fc20cb67ddaef099f27020f6037b58db7e158..4a803754ab0684fb3247248e21151aaa04a4063d 100644
--- a/ui/base/ime/chromeos/input_method_manager.h
+++ b/ui/base/ime/chromeos/input_method_manager.h
@@ -303,6 +303,12 @@ class UI_BASE_IME_EXPORT InputMethodManager {
   // Notify the IME menu activation changed if the current profile's activation
   // is different from previous.
   virtual void MaybeNotifyImeMenuActivationChanged() = 0;
+
+  // Shows the virtual keyboard with the specific keyset.

[James Cook, 2016/09/12 17:05:57]

nit: Give an example of what "keyset" can be, like (e.g. "emoji").

[Azure Wei, 2016/09/14 06:53:28]

Done.

+  virtual void ShowInputViewWithKeyset(const std::string& keyset) = 0;
+
+  // Returns whether the feature features::kEHVInputOnImeMenu has been enabled.
+  virtual bool IsEHVInputOnImeMenuEnabled() = 0;

[James Cook, 2016/09/12 17:05:57]

This should be called something else. I don't know what EHV means, and neither
will anyone reading the calling code.

IsEmojiHandwritingVoiceOnImeMenuEnabled?

AreExtraInputsOnImeMenuEnabled and document what all the extra inputs are?

separate functions for each part?

[Azure Wei, 2016/09/14 06:53:28]

Renamed as IsEmojiHandwritingVoiceOnImeMenuEnabled.

 };
 
 }  // namespace input_method