Implement Android WebView.clearCache

android_webview/common/render_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.
 
 // Multiply-included file, no traditional include guard.
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
 
 // Singly-included section for enums and custom IPC traits.
 #ifndef ANDROID_WEBVIEW_COMMON_RENDER_VIEW_MESSAGES_H_
 #define ANDROID_WEBVIEW_COMMON_RENDER_VIEW_MESSAGES_H_
 
 
 namespace IPC {
 
 // TODO - add enums and custom IPC traits here when needed.
 
 }  // namespace IPC
 
 #endif  // ANDROID_WEBVIEW_COMMON_RENDER_VIEW_MESSAGES_H_
 
 #define IPC_MESSAGE_START AndroidWebViewMsgStart
 
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the browser to the renderer process.
 
+// Tells the renderer to drop all WebCore memory cache.
+IPC_MESSAGE_CONTROL0(AwViewMsg_ClearCache);
+
 // Request for the renderer to determine if the document contains any image
 // elements.  The id should be passed in the response message so the response
 // can be associated with the request.
 IPC_MESSAGE_ROUTED1(AwViewMsg_DocumentHasImages,
                     int /* id */)
 
 //-----------------------------------------------------------------------------
 // RenderView messages
 // These are messages sent from the renderer to the browser process.
 
 // Response to AwViewMsg_DocumentHasImages request.
 IPC_MESSAGE_ROUTED2(AwViewHostMsg_DocumentHasImagesResponse,
                     int, /* id */
                     bool /* has_images */)