IME for Mus: Make InputMethodMus use the IME Mojo API.

services/ui/public/interfaces/ime.mojom

Index: services/ui/public/interfaces/ime.mojom
diff --git a/services/ui/public/interfaces/ime.mojom b/services/ui/public/interfaces/ime.mojom
index ed1f56d15a26f4ebd202b8cd677a2bb7c3abda53..240b3134456fe7865c106ea34e88b287d6f2cda7 100644
--- a/services/ui/public/interfaces/ime.mojom
+++ b/services/ui/public/interfaces/ime.mojom
@@ -102,6 +102,9 @@ interface TextInputClient {
   // Corresponds to "input method result" functions of ui::TextInputClient.
   OnCompositionEvent(CompositionEvent event);
 
+  // Called when IME driver didn't handle the event.

[sky, 2016/08/18 23:43:07]

Please better document when this is called. Maybe the documentation should be in
InputMethod, e.g.:

// Called to process a key event. If the event is not handled by
// InputMethod OnUnhandledEvent is called on TextInputClient.

and then you could refer to ProcessKeyEvent here.

Also, not for this cl, but remind me why we went with the name of
TextInputClient instead of InputMethodClient? Wouldn't that better match who the
client is paired to?

[Hadi, 2016/08/25 18:06:06]

Done.
I agree that InputMethodClient is a better name. I chose to go with
TextInputClient so it matches with the corresponding ui::TextInputClient, which
has a similar functionality.

+  OnUnhandledEvent(ui.mojom.Event key_event);
+
   // TODO(moshayedi): Add functions corresponding to ui::TextInputClient for:
   // - Input text confirmation
   // - Document content operations