Make PostTask and Send failures in input routing fatal.

content/renderer/render_widget.cc

 // 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.
 
 #include "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 507 matching lines @@
     return false;
   }
 
   // If given a messsage without a routing ID, then assign our routing ID.
   if (message->routing_id() == MSG_ROUTING_NONE)
     message->set_routing_id(routing_id_);
 
   return RenderThread::Get()->Send(message);
 }
 
+void RenderWidget::SendOrCrash(IPC::Message* message) {
+  bool result = Send(message);
+  CHECK(closing_ || result) << "Failed to send message";
+}
+
 void RenderWidget::SetWindowRectSynchronously(
     const gfx::Rect& new_window_rect) {
   ResizeParams params;
   params.screen_info = screen_info_;
   params.new_size = new_window_rect.size();
   params.physical_backing_size =
       gfx::ScaleToCeiledSize(new_window_rect.size(), device_scale_factor_);
   params.visible_viewport_size = new_window_rect.size();
   params.is_fullscreen_granted = is_fullscreen_granted_;
   params.display_mode = display_mode_;
@@ skipping 313 matching lines @@
 void RenderWidget::ClearEditCommands() {
   edit_commands_.clear();
 }
 
 void RenderWidget::OnDidOverscroll(const ui::DidOverscrollParams& params) {
   Send(new InputHostMsg_DidOverscroll(routing_id_, params));
 }
 
 void RenderWidget::OnInputEventAck(
     std::unique_ptr<InputEventAck> input_event_ack) {
-  Send(new InputHostMsg_HandleInputEvent_ACK(routing_id_, *input_event_ack));
+  SendOrCrash(
+      new InputHostMsg_HandleInputEvent_ACK(routing_id_, *input_event_ack));
 }
 
 void RenderWidget::NotifyInputEventHandled(
     blink::WebInputEvent::Type handled_type,
     InputEventAckState ack_result) {
   RenderThreadImpl* render_thread = RenderThreadImpl::current();
   InputHandlerManager* input_handler_manager =
       render_thread ? render_thread->input_handler_manager() : NULL;
   if (input_handler_manager) {
     input_handler_manager->NotifyInputEventHandledOnMainThread(
@@ skipping 1214 matching lines @@
 blink::WebInputMethodController* RenderWidget::GetInputMethodController()
     const {
   // TODO(ekaramad): Remove this CHECK when GetWebWidget() is
   // always a WebFrameWidget.
   CHECK(GetWebWidget()->isWebFrameWidget());
   return static_cast<blink::WebFrameWidget*>(GetWebWidget())
       ->getActiveWebInputMethodController();
 }
 
 }  // namespace content