PlzNavigate: stop navigations when opening a document for write

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index d5c33482d88e38ac0213b843c570a1be040a4e26..e3caa3fb129aaf9c739101f871d9022a553ae2de 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -371,6 +371,7 @@ IPC_STRUCT_TRAITS_BEGIN(content::BeginNavigationParams)
   IPC_STRUCT_TRAITS_MEMBER(searchable_form_encoding)
   IPC_STRUCT_TRAITS_MEMBER(initiator_origin)
   IPC_STRUCT_TRAITS_MEMBER(client_side_redirect_url)
+  IPC_STRUCT_TRAITS_MEMBER(renderer_navigation_id)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::StartNavigationParams)
@@ -905,6 +906,12 @@ IPC_MESSAGE_ROUTED4(FrameMsg_CommitNavigation,
                     content::RequestNavigationParams  /* request_params */)
 
 // PlzNavigate
+// Informs the renderer that the browser stopped processing a renderer-initiated
+// navigation.
+IPC_MESSAGE_ROUTED1(FrameMsg_DroppedNavigation,

[Charlie Reis, 2017/03/20 06:34:44]

We seem to be a bit inconsistent with calling this dropped, stopped, ignored, or
canceled.  (Also aborted, but maybe that's always the other direction?)  Since
we know it needs to be differentiated from failed, maybe we should pick one term
and use it consistently?

+                    int /* renderer_navigation_id */)
+
+// PlzNavigate
 // Tells the renderer that a navigation failed with the error code |error_code|
 // and that the renderer should display an appropriate error page.
 IPC_MESSAGE_ROUTED4(FrameMsg_FailedNavigation,
@@ -1505,6 +1512,11 @@ IPC_MESSAGE_ROUTED2(FrameHostMsg_BeginNavigation,
                     content::CommonNavigationParams,
                     content::BeginNavigationParams)
 
+// PlzNavigate
+// Tells the browser to abort an ongoing renderer-initiated navigation. This is
+// used when the page calls document.open.
+IPC_MESSAGE_ROUTED0(FrameHostMsg_AbortNavigation)
+
 // Sent as a response to FrameMsg_VisualStateRequest.
 // The message is delivered using RenderWidget::QueueMessage.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_VisualStateResponse, uint64_t /* id */)