PlzNavigate: Release StreamHandle.

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 660 matching lines @@
 // Causes a window previously opened via RenderMessageFilter::CreateNewWindow to
 // be shown on the screen. This message is routed to the preexisting frame that
 // opened the window, and |pending_widget_routing_id| corresponds to the
 // widget routing id from the CreateNewWindow reply.
 IPC_MESSAGE_ROUTED4(FrameHostMsg_ShowCreatedWindow,
                     int /* pending_widget_routing_id */,
                     WindowOpenDisposition /* disposition */,
                     gfx::Rect /* initial_rect */,
                     bool /* opened_by_user_gesture */)
 
+// Let the browser know a StreamHandle has been consumed and can be released.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_StreamHandleConsumed, GURL /* stream_url */)
+
 #if BUILDFLAG(ENABLE_PLUGINS)
 IPC_STRUCT_TRAITS_BEGIN(content::PepperRendererInstanceData)
   IPC_STRUCT_TRAITS_MEMBER(render_process_id)
   IPC_STRUCT_TRAITS_MEMBER(render_frame_id)
   IPC_STRUCT_TRAITS_MEMBER(document_url)
   IPC_STRUCT_TRAITS_MEMBER(plugin_url)
   IPC_STRUCT_TRAITS_MEMBER(is_potentially_secure_plugin_context)
 IPC_STRUCT_TRAITS_END()
 #endif
 
@@ skipping 1009 matching lines @@
                     int /* nfr_request_id */,
                     float /* distance */)
 
 IPC_MESSAGE_ROUTED0(FrameHostMsg_NavigationHandledByEmbedder)
 #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.