Split FaviconHelper in two: ImageLoadingHelper and FaviconHelper

content/common/image_messages.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Multiply-included message file, no traditional include guard.
+#include <vector>
+
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_param_traits.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+#define IPC_MESSAGE_START ImageMsgStart
+
+// Messages sent from the browser to the renderer.
+
+// Requests the renderer to download the specified image, decode it,
+// and send the image data back via ImageHostMsg_DidDownloadImage.
+IPC_MESSAGE_ROUTED3(ImageMsg_DownloadImage,
+                    int /* identifier for the request */,
+                    GURL /* URL of the image */,
+                    int /* Preferred image size. Passed on to
+                           ImageHostMsg_DidDownloadFavicon, unused otherwise */)
+
+// Messages sent from the renderer to the browser.
+
+IPC_MESSAGE_ROUTED4(ImageHostMsg_DidDownloadImage,
+                    int /* Identifier of the request */,
+                    GURL /* URL of the image */,
+                    int /* Preferred image size passed to
+                           ImageMsg_DownloadImage */,
+                    std::vector<SkBitmap> /* image_data */)
+