Move download messages from Renderer to Frame filter.

content/common/frame_messages.h

 // Copyright 2013 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.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 963 matching lines @@
 IPC_MESSAGE_ROUTED1(FrameHostMsg_DidChangeLoadProgress,
                     double /* load_progress */)
 
 // Requests that the given URL be opened in the specified manner.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_OpenURL, FrameHostMsg_OpenURL_Params)
 
 // Notifies the browser that a frame finished loading.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_DidFinishLoad,
                     GURL /* validated_url */)
 
+// Initiates a download based on user actions like 'ALT+click'.
+IPC_MESSAGE_CONTROL5(FrameHostMsg_DownloadUrl,
+                     int /* render_view_id */,
+                     int /* render_frame_id */,
+                     GURL /* url */,
+                     content::Referrer /* referrer */,
+                     base::string16 /* suggested_name */)
+
+// Asks the browser to save a image (for <canvas> or <img>) from a data URL.
+// Note: |data_url| is the contents of a data:URL, and that it's represented as
+// a string only to work around size limitations for GURLs in IPC messages.
+IPC_MESSAGE_CONTROL3(FrameHostMsg_SaveImageFromDataURL,
+                     int /* render_view_id */,
+                     int /* render_frame_id */,
+                     std::string /* data_url */)
+
 // Sent when after the onload handler has been invoked for the document
 // in this frame. Sent for top-level frames. |report_type| and |ui_timestamp|
 // are used to report navigation metrics starting on the ui input event that
 // triggered the navigation timestamp.
 IPC_MESSAGE_ROUTED2(FrameHostMsg_DocumentOnLoadCompleted,
                     FrameMsg_UILoadMetricsReportType::Value /* report_type */,
                     base::TimeTicks /* ui_timestamp */)
 
 // Notifies that the initial empty document of a view has been accessed.
 // After this, it is no longer safe to show a pending navigation's URL without
@@ skipping 463 matching lines @@
 IPC_MESSAGE_ROUTED3(FrameHostMsg_FindMatchRects_Reply,
                     int /* version */,
                     std::vector<gfx::RectF> /* rects */,
                     gfx::RectF /* active_rect */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.