import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

image/decoders/icon/gtk/nsIconChannel.h

@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_decoders_icon_gtk_nsIconChannel_h
+#define mozilla_image_decoders_icon_gtk_nsIconChannel_h
+
+#include "mozilla/Attributes.h"
+
+#include "nsIChannel.h"
+#include "nsIStreamListener.h"
+#include "nsIURI.h"
+#include "nsIIconURI.h"
+#include "nsCOMPtr.h"
+
+/// This class is the gnome implementation of nsIconChannel. It basically asks
+/// gtk/gnome for an icon, saves it as a tmp icon, and creates a new channel for
+/// that file to which all calls will be proxied.
+class nsIconChannel final : public nsIChannel
+{
+  public:
+    NS_DECL_ISUPPORTS
+    NS_FORWARD_NSIREQUEST(mRealChannel->)
+    NS_FORWARD_NSICHANNEL(mRealChannel->)
+
+    nsIconChannel() { }
+
+    static void Shutdown();
+
+    /// Called by nsIconProtocolHandler after it creates this channel.
+    /// Must be called before calling any other function on this object.
+    /// If this method fails, no other function must be called on this object.
+    nsresult Init(nsIURI* aURI);
+  private:
+    ~nsIconChannel() { }
+    /// The channel to the temp icon file (e.g. to /tmp/2qy9wjqw.html).
+    /// Will always be non-null after a successful Init.
+    nsCOMPtr<nsIChannel> mRealChannel;
+
+    nsresult InitWithGIO(nsIMozIconURI* aIconURI);
+};
+
+#endif // mozilla_image_decoders_icon_gtk_nsIconChannel_h