Make PostTask and Send failures in input routing fatal.

content/renderer/input/input_event_filter.cc

Index: content/renderer/input/input_event_filter.cc
diff --git a/content/renderer/input/input_event_filter.cc b/content/renderer/input/input_event_filter.cc
index a92e00e61b7c6f1a87e671be2ee8b435290918d2..063df1e101422751d8ce935038f8e5ff38f19e6c 100644
--- a/content/renderer/input/input_event_filter.cc
+++ b/content/renderer/input/input_event_filter.cc
@@ -178,9 +178,10 @@ bool InputEventFilter::OnMessageReceived(const IPC::Message& message) {
       return false;
   }
 
-  target_task_runner_->PostTask(
+  CHECK(target_task_runner_->PostTask(
       FROM_HERE, base::Bind(&InputEventFilter::ForwardToHandler, this, message,
-                            received_time));
+                            received_time)))
+      << "PostTask failed";
   return true;
 }
 
@@ -198,7 +199,9 @@ void InputEventFilter::ForwardToHandler(const IPC::Message& message,
         "input",
         "InputEventFilter::ForwardToHandler::ForwardToMainListener",
         TRACE_EVENT_SCOPE_THREAD);
-    main_task_runner_->PostTask(FROM_HERE, base::Bind(main_listener_, message));
+    CHECK(main_task_runner_->PostTask(FROM_HERE,
+                                      base::Bind(main_listener_, message)))
+        << "PostTask failed";
     return;
   }
 
@@ -259,9 +262,10 @@ void InputEventFilter::DidForwardToHandlerAndOverscroll(
 }
 
 void InputEventFilter::SendMessage(std::unique_ptr<IPC::Message> message) {
-  io_task_runner_->PostTask(
+  CHECK(io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&InputEventFilter::SendMessageOnIOThread, this,
-                            base::Passed(&message)));
+                            base::Passed(&message))))
+      << "PostTask failed";
 }
 
 void InputEventFilter::SendMessageOnIOThread(
@@ -271,7 +275,7 @@ void InputEventFilter::SendMessageOnIOThread(
   if (!sender_)
     return;  // Filter was removed.
 
-  sender_->Send(message.release());
+  CHECK(sender_->Send(message.release())) << "Send message failed";
 }
 
 void InputEventFilter::HandleEventOnMainThread(
@@ -303,9 +307,10 @@ void InputEventFilter::NeedsMainFrame(int routing_id) {
     return;
   }
 
-  target_task_runner_->PostTask(
+  CHECK(target_task_runner_->PostTask(
       FROM_HERE,
-      base::Bind(&InputEventFilter::NeedsMainFrame, this, routing_id));
+      base::Bind(&InputEventFilter::NeedsMainFrame, this, routing_id)))
+      << "PostTask failed";
 }
 
 }  // namespace content