Mus experiment in content shell on Android.

content/shell/browser/shell.h

Index: content/shell/browser/shell.h
diff --git a/content/shell/browser/shell.h b/content/shell/browser/shell.h
index da0089d5f21dcd8dbe1bc8bf3bbc431390b95764..fef0b67034967075ef4b87ac05131caf52fda2f0 100644
--- a/content/shell/browser/shell.h
+++ b/content/shell/browser/shell.h
@@ -20,6 +20,7 @@
 
 #if defined(OS_ANDROID)
 #include "base/android/scoped_java_ref.h"
+#include "services/ui/demo/mus_demo.h"  // nogncheck
 #elif defined(USE_AURA)
 #if defined(OS_CHROMEOS)
 
@@ -113,6 +114,8 @@ class Shell : public WebContentsDelegate,
 #elif defined(OS_ANDROID)
   // Registers the Android Java to native methods.
   static bool Register(JNIEnv* env);
+  void StartMusDemo(JNIEnv* env,
+                    const base::android::JavaParamRef<jobject>& caller);
 #endif
 
   // WebContentsDelegate
@@ -247,6 +250,7 @@ class Shell : public WebContentsDelegate,
 
 #if defined(OS_ANDROID)
   base::android::ScopedJavaGlobalRef<jobject> java_object_;
+  std::unique_ptr<ui::demo::MusDemo> mus_demo_;
 #elif defined(USE_AURA)
 #if defined(OS_CHROMEOS)
   static wm::WMTestHelper* wm_test_helper_;