mandoline: Fix character entry in html_viewer on Linux.

mandoline/ui/aura/window_tree_host_mojo.h

Index: mandoline/ui/aura/window_tree_host_mojo.h
diff --git a/mandoline/ui/aura/window_tree_host_mojo.h b/mandoline/ui/aura/window_tree_host_mojo.h
index c00c7748636d331cb8533b978f37e7f5c7dab54d..77f4bf0c64891b0dcb9f4a1ecbc5d958deb592d0 100644
--- a/mandoline/ui/aura/window_tree_host_mojo.h
+++ b/mandoline/ui/aura/window_tree_host_mojo.h
@@ -23,6 +23,7 @@ class Shell;
 
 namespace mandoline {
 
+class InputMethodMandoline;
 class SurfaceContextFactory;
 
 class WindowTreeHostMojo : public aura::WindowTreeHost,
@@ -61,6 +62,8 @@ class WindowTreeHostMojo : public aura::WindowTreeHost,
 
   gfx::Rect bounds_;
 
+  scoped_ptr<InputMethodMandoline> input_method_;
+
   scoped_ptr<SurfaceContextFactory> context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMojo);