From 81ae6fd494b3ddda32a641b0054c81e57aa8b007 Mon Sep 17 00:00:00 2001
From: alwu <alwu@mozilla.com>
Date: Tue, 10 Jul 2018 10:37:33 -0700
Subject: [PATCH] Bug 1466926 - part1 : always allow extension background
 script to autoplay. r=cpearce

In present web extension design (both Firefox and Chrome), background script can autoplay.
We don't want to break this design, so we would always allow it to autoplay.

MozReview-Commit-ID: 9BfWgll7PNx

--HG--
extra : rebase_source : 7996daa06c31a84a2aea9008daa9bddfcde98c74
---
 dom/base/nsDocument.cpp      | 6 ++++++
 dom/base/nsIDocument.h       | 4 ++++
 dom/media/AutoplayPolicy.cpp | 5 +++++
 3 files changed, 15 insertions(+)

diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index a6de74531215..a420e7feb372 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -12638,6 +12638,12 @@ nsIDocument::HasBeenUserGestureActivated()
   return mUserGestureActivated;
 }
 
+bool
+nsIDocument::IsExtensionPage() const
+{
+  return BasePrincipal::Cast(NodePrincipal())->AddonPolicy();
+}
+
 nsIDocument*
 nsIDocument::GetSameTypeParentDocument()
 {
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index e7af1c6118d2..9e7412d9705f 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -3439,6 +3439,10 @@ public:
   // document in the document tree.
   bool HasBeenUserGestureActivated();
 
+  // This document is a WebExtension page, it might be a background page, a
+  // popup, a visible tab, a visible iframe ...e.t.c.
+  bool IsExtensionPage() const;
+
   bool HasScriptsBlockedBySandbox();
 
   bool InlineScriptAllowedByCSP();
diff --git a/dom/media/AutoplayPolicy.cpp b/dom/media/AutoplayPolicy.cpp
index 0b8bd819daf7..5a9766c69b44 100644
--- a/dom/media/AutoplayPolicy.cpp
+++ b/dom/media/AutoplayPolicy.cpp
@@ -71,6 +71,11 @@ IsWindowAllowedToPlay(nsPIDOMWindowInner* aWindow)
     return true;
   }
 
+  if (approver->IsExtensionPage()) {
+    // Always allow extension page to autoplay.
+    return true;
+  }
+
   return false;
 }