Revert 252883 "Remove tests and code for showModalDialog"

content/common/view_messages.h

 // 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 1162 matching lines @@
                     bool /* opened_by_user_gesture */)
 
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ShowWidget,
                     int /* route_id */,
                     gfx::Rect /* initial_pos */)
 
 // Message to show a full screen widget.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowFullscreenWidget,
                     int /* route_id */)
 
+// This message is sent after ViewHostMsg_ShowView to cause the RenderView
+// to run in a modal fashion until it is closed.
+IPC_SYNC_MESSAGE_ROUTED1_0(ViewHostMsg_RunModal,
+                           int /* opener_id */)
+
 // Indicates the renderer is ready in response to a ViewMsg_New or
 // a ViewMsg_CreatingNew_ACK.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_RenderViewReady)
 
 // Indicates the renderer process is gone.  This actually is sent by the
 // browser process to itself, but keeps the interface cleaner.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_RenderProcessGone,
                     int, /* this really is base::TerminationStatus */
                     int /* exit_code */)
 
@@ skipping 779 matching lines @@
 // synchronously (see crbug.com/120597). This IPC message sends the character
 // bounds after every composition change to always have correct bound info.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.