Hold a reference to any kind of context in WindowAndroid.

ui/android/window_android.cc

Index: ui/android/window_android.cc
diff --git a/ui/android/window_android.cc b/ui/android/window_android.cc
index 5fe7779a2716b142c9818f9a3b8dde01d9d0cd9e..a679f310ab413c551aeff30e906f006bc3db2ffe 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -132,6 +132,12 @@ bool WindowAndroid::CanRequestPermission(const std::string& permission) {
       base::android::ConvertUTF8ToJavaString(env, permission).obj());
 }
 
+base::android::ScopedJavaLocalRef<jobject>
+WindowAndroid::GetJavaDisplayContext() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_WindowAndroid_getDisplayContext(env, GetJavaObject().obj());
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------