[Android] Upstream Modal Dialogs functionality

content/public/browser/android/content_view_core.h

Index: content/public/browser/android/content_view_core.h
diff --git a/content/public/browser/android/content_view_core.h b/content/public/browser/android/content_view_core.h
index a1871963e26520c193f0b729e39d629fe475473f..e5eee9a46267b038488f1e575526cd58620f6a10 100644
--- a/content/public/browser/android/content_view_core.h
+++ b/content/public/browser/android/content_view_core.h
@@ -35,6 +35,8 @@ class ContentViewCore {
                                  WebContents* web_contents);
   static ContentViewCore* GetNativeContentViewCore(JNIEnv* env, jobject obj);
 
+  virtual base::android::ScopedJavaLocalRef<jobject> GetJavaObject() = 0;
+
  protected:
   virtual ~ContentViewCore() {};
 };