Implement Linux IME support

services/native_viewport/native_viewport_impl.cc

Index: services/native_viewport/native_viewport_impl.cc
diff --git a/services/native_viewport/native_viewport_impl.cc b/services/native_viewport/native_viewport_impl.cc
index a07ca9ec41d6842ec27b1082912d6d545c3e538d..02d24198e9aee5a20935aa93327dce8751d04b00 100644
--- a/services/native_viewport/native_viewport_impl.cc
+++ b/services/native_viewport/native_viewport_impl.cc
@@ -94,6 +94,11 @@ void NativeViewportImpl::SetEventDispatcher(
   event_dispatcher_ = dispatcher.Pass();
 }
 
+void NativeViewportImpl::SetKeyEventDispatcher(
+    mojo::NativeViewportEventDispatcherPtr dispatcher) {
+  key_event_dispatcher_ = dispatcher.Pass();
+}
+
 void NativeViewportImpl::OnMetricsChanged(mojo::ViewportMetricsPtr metrics) {
   if (metrics_->Equals(*metrics))
     return;
@@ -149,6 +154,13 @@ bool NativeViewportImpl::OnEvent(mojo::EventPtr event) {
       pointers_waiting_on_ack_.erase(event->pointer_data->pointer_id);
       break;
 
+    case mojo::EventType::KEY_PRESSED:
+    case mojo::EventType::KEY_RELEASED:
+      if (key_event_dispatcher_.get())
+        key_event_dispatcher_->OnEvent(event.Pass(), callback);
+      return false;
+      break;
+
     default:
       break;
   }