From 61dbcdeb2a36db2dad2fbf6a626a27412875eec0 Mon Sep 17 00:00:00 2001
From: Ryan Hunt <rhunt@eqrion.net>
Date: Wed, 24 Apr 2019 23:28:31 -0500
Subject: [PATCH] Bug 1525720, part 4 - Assert in DrawSnapshot if not the
 chrome process. r=mattwoodrow

This API is only intended to be used in the chrome process and this commit
makes this explicit to simplify a later refactoring.

Differential Revision: https://phabricator.services.mozilla.com/D31434

--HG--
extra : source : b255e0a84e12657a62a2cdfd4a4c2ebb893b2a0d
---
 dom/base/nsFrameLoader.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index 22a9832fa4e5..3f7776dcfe72 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -3235,6 +3235,12 @@ void nsFrameLoader::Print(uint64_t aOuterWindowID,
 already_AddRefed<mozilla::dom::Promise> nsFrameLoader::DrawSnapshot(
     double aX, double aY, double aW, double aH, double aScale,
     const nsAString& aBackgroundColor, mozilla::ErrorResult& aRv) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  if (!XRE_IsParentProcess()) {
+    aRv = NS_ERROR_FAILURE;
+    return nullptr;
+  }
+
   RefPtr<nsIGlobalObject> global = GetOwnerContent()->GetOwnerGlobal();
   RefPtr<Promise> promise = Promise::Create(global, aRv);
   if (NS_WARN_IF(aRv.Failed())) {