AndroidOverlay implementation using Dialog.

content/browser/frame_host/render_frame_host_android.h

Index: content/browser/frame_host/render_frame_host_android.h
diff --git a/content/browser/frame_host/render_frame_host_android.h b/content/browser/frame_host/render_frame_host_android.h
index 443b1fea6e3f97481871de7db2eae188cb12d8f2..57680ab4311817346fb685b7ff1728a6b8c7af0b 100644
--- a/content/browser/frame_host/render_frame_host_android.h
+++ b/content/browser/frame_host/render_frame_host_android.h
@@ -41,6 +41,11 @@ class RenderFrameHostAndroid : public base::SupportsUserData::Data {
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>&) const;
 
+  // Returns UnguessableToken.
+  base::android::ScopedJavaLocalRef<jobject> GetAndroidOverlayRoutingToken(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>&) const;
+
  private:
   RenderFrameHostImpl* const render_frame_host_;
   service_manager::mojom::InterfaceProviderPtr interface_provider_ptr_;