Bug 1145981 - Do not crash when a DIB texture is updated without a compositor. r=jrmuizel

gfx/layers/TextureDIB.cpp

@@ -145,6 +145,12 @@ DIBTextureHost::BindTextureSource(CompositableTextureSourceRef& aTexture)
 void
 DIBTextureHost::Updated(const nsIntRegion* aRegion)
 {
+  if (!mCompositor) {
+    // This can happen if we send textures to a compositable that isn't yet
+    // attached to a layer.
+    return;
+  }
+
   if (!mTextureSource) {
     mTextureSource = mCompositor->CreateDataTextureSource(mFlags);
   }

gfx/layers/composite/TextureHost.cpp

@@ -497,10 +497,8 @@ BufferTextureHost::Upload(nsIntRegion *aRegion)
     return false;
   }
   if (!mCompositor) {
-    NS_WARNING("Tried to upload without a compositor. Skipping texture upload...");
-    // If we are in this situation it means we should have called SetCompositor
-    // earlier. It is conceivable that on certain rare conditions with async-video
-    // we may end up here for the first frame, but this should not happen repeatedly.
+    // This can happen if we send textures to a compositable that isn't yet
+    // attached to a layer.
     return false;
   }
   if (mFormat == gfx::SurfaceFormat::UNKNOWN) {