Use process/control messages (instead of RVH messages) for layout tests.

content/shell/browser/layout_test/blink_test_controller.cc

 // 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.
 
 #include "content/shell/browser/layout_test/blink_test_controller.h"
 
 #include <stddef.h>
 
 #include <iostream>
 #include <set>
@@ skipping 395 matching lines @@
     return bluetooth_chooser_factory_->RunBluetoothChooser(frame,
                                                            event_handler);
   }
   return base::MakeUnique<LayoutTestFirstDeviceBluetoothChooser>(event_handler);
 }
 
 bool BlinkTestController::OnMessageReceived(const IPC::Message& message) {
   DCHECK(CalledOnValidThread());
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(BlinkTestController, message)
-    IPC_MESSAGE_HANDLER(ShellViewHostMsg_PrintMessage, OnPrintMessage)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_TextDump, OnTextDump)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_InitiateLayoutDump,
                         OnInitiateLayoutDump)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_ImageDump, OnImageDump)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_AudioDump, OnAudioDump)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_OverridePreferences,
                         OnOverridePreferences)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_TestFinished, OnTestFinished)
     IPC_MESSAGE_HANDLER(ShellViewHostMsg_ClearDevToolsLocalStorage,
                         OnClearDevToolsLocalStorage)
@@ skipping 324 matching lines @@
   }
 
   // Continue finishing the test.
   RenderViewHost* render_view_host =
       main_window_->web_contents()->GetRenderViewHost();
   render_view_host->Send(new ShellViewMsg_LayoutDumpCompleted(
       render_view_host->GetRoutingID(), stitched_layout_dump));
 }
 
 void BlinkTestController::OnPrintMessage(const std::string& message) {
+  DCHECK(CalledOnValidThread());
   printer_->AddMessageRaw(message);
 }
 
 void BlinkTestController::OnOverridePreferences(const WebPreferences& prefs) {
   should_override_prefs_ = true;
   prefs_ = prefs;
 
   // Notifies the main RenderViewHost that Blink preferences changed so
   // immediately apply the new settings and to avoid re-usage of cached
   // preferences that are now stale. RenderViewHost::UpdateWebkitPreferences is
@@ skipping 173 matching lines @@
   } else {
     printer_->AddErrorMessage(base::StringPrintf(
         "FAIL: Unexpected sendBluetoothManualChooserEvent() event name '%s'.",
         event_name.c_str()));
     return;
   }
   bluetooth_chooser_factory_->SendEvent(event, argument);
 }
 
 }  // namespace content