Fixs bug resulting in double event delivery in mus

ui/views/mus/views_mus_test_suite.cc

Index: ui/views/mus/views_mus_test_suite.cc
diff --git a/ui/views/mus/views_mus_test_suite.cc b/ui/views/mus/views_mus_test_suite.cc
index 0812025fd782545e8c2c5463d779bccc9cd155e9..26236a5bce68a6de7264598974e70d1293a2f63b 100644
--- a/ui/views/mus/views_mus_test_suite.cc
+++ b/ui/views/mus/views_mus_test_suite.cc
@@ -25,6 +25,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/test/env_test_helper.h"
+#include "ui/aura/test/mus/input_method_mus_test_api.h"
 #include "ui/aura/window.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/views/mus/desktop_window_tree_host_mus.h"
@@ -87,6 +88,12 @@ class PlatformTestHelperMus : public PlatformTestHelper {
     static_cast<aura::WindowTreeClientDelegate*>(mus_client_.get())
         ->OnEmbedRootDestroyed(window_tree_host);
   }
+  void DisableMusInputMethod(Widget* widget) override {
+    aura::WindowTreeHostMus* window_tree_host =
+        static_cast<aura::WindowTreeHostMus*>(
+            widget->GetNativeView()->GetHost());
+    aura::InputMethodMusTestApi::Disable(window_tree_host->input_method());
+  }
 
  private:
   std::unique_ptr<MusClient> mus_client_;