Mac: ExternalPopupMenu::close should hide a showing popup menu.

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 1188 matching lines @@
 // Send in response to a ViewMsg_UpdateScreenRects so that the renderer can
 // throttle these messages.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UpdateScreenRects_ACK)
 
 // Sent by the renderer process to request that the browser move the view.
 // This corresponds to the window.resizeTo() and window.moveTo() APIs, and
 // the browser may ignore this message.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_RequestMove,
                     gfx::Rect /* position */)
 
-// Message to show a popup menu using native cocoa controls (Mac only).
+// Message to show/hide a popup menu using native cocoa controls
+// (Mac and Android only).
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowPopup,
                     ViewHostMsg_ShowPopup_Params)
+IPC_MESSAGE_ROUTED0(ViewHostMsg_HidePopup)
 
 // Response from ViewMsg_ScriptEvalRequest. The ID is the parameter supplied
 // to ViewMsg_ScriptEvalRequest. The result has the value returned by the
 // script as its only element, one of Null, Boolean, Integer, Real, Date, or
 // String.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ScriptEvalResponse,
                     int  /* id */,
                     base::ListValue  /* result */)
 
 // Result of string search in the page.
@@ skipping 750 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.