Bug 1486030 - Don't keep a null texture in the video bridge texture map. r=sotaro

Differential Revision: https://phabricator.services.mozilla.com/D4319

--HG--
extra : moz-landing-system : lando

gfx/layers/ipc/VideoBridgeParent.cpp

@@ -64,6 +64,11 @@ VideoBridgeParent::AllocPTextureParent(const SurfaceDescriptor& aSharedData,
 {
   PTextureParent* parent =
     TextureHost::CreateIPDLActor(this, aSharedData, aReadLock, aLayersBackend, aFlags, aSerial, Nothing());
+
+  if (!parent) {
+    return nullptr;
+  }
+
   mTextureMap[aSerial] = parent;
   return parent;
 }