ARC: Show virtual keyboard when necessary on text input type change events.

components/arc/ime/arc_ime_bridge.h

Index: components/arc/ime/arc_ime_bridge.h
diff --git a/components/arc/ime/arc_ime_bridge.h b/components/arc/ime/arc_ime_bridge.h
index 7c969b33c1266b07896b9800ce872f164b575bc8..1fcfc1b2075c97a313314a8c9a2b846a60a6fb3c 100644
--- a/components/arc/ime/arc_ime_bridge.h
+++ b/components/arc/ime/arc_ime_bridge.h
@@ -45,6 +45,9 @@ class ArcImeBridge : public ArcService,
   // Injects the custom IPC host object for testing purpose only.
   void SetIpcHostForTesting(scoped_ptr<ArcImeIpcHost> test_ipc_host);
 
+  // Injects the custom IME for testing purpose only.
+  void SetInputMethodForTesting(ui::InputMethod* test_input_method);
+
   // Overridden from aura::EnvObserver:
   void OnWindowInitialized(aura::Window* new_window) override;
 
@@ -104,6 +107,8 @@ class ArcImeBridge : public ArcService,
   aura::WindowTracker arc_windows_;
   aura::WindowTracker focused_arc_window_;
 
+  ui::InputMethod* test_input_method_;
+
   DISALLOW_COPY_AND_ASSIGN(ArcImeBridge);
 };