Propagate inert state to OOPIFs when a modal dialog is active

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 1405 matching lines @@
 IPC_MESSAGE_ROUTED1(FrameHostMsg_FrameRectChanged, gfx::Rect /* frame_rect */)
 
 // Sent by a parent frame to update its child's viewport intersection rect for
 // use by the IntersectionObserver API.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_UpdateViewportIntersection,
                     gfx::Rect /* viewport_intersection */)
 
 // Informs the child that the frame has changed visibility.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_VisibilityChanged, bool /* visible */)
 
+// Sets or unsets the inert bit on a remote frame.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_SetIsInert, bool /* inert */)
+
 // Indicates that this frame recieved a user gesture, so that the state can be
 // propagated to any remote frames.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_SetHasReceivedUserGesture)
 
 // Used to tell the browser what the DevTools FrameId is. Needed by Headless
 // Chrome.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_SetDevToolsFrameId, std::string)
 
 // Used to tell the parent that the user right clicked on an area of the
 // content area, and a context menu should be shown for it. The params
@@ skipping 237 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.