Modularize Compact Language Detector 2 (CLD2) data sources

components/translate/content/common/data_file_cld_data_provider_messages.h

+// Copyright 2014 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 message file, hence no include guard.
+
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+#include "ipc/ipc_platform_file.h"
+
+// Note, for clean abstraction there is only one "CldDataProviderMessageStart"
+// that is declared in ipc_message_start.h. All implementations share it,
+// which avoids the need for each implementation to make its own entry.
+// This would otherwise be very messy, as there is no mechanism to customize
+// or extend the IPCMessageStart enum.
+#define IPC_MESSAGE_START CldDataProviderMsgStart
+
+// Informs the browser process that Compact Language Detector (CLD) data is
+// needed in the form of a data file.
+// This message is sent by a DataFileRendererCldDataProvider to a
+// DataFileBrowserCldDataProvider.
+IPC_MESSAGE_ROUTED0(ChromeViewHostMsg_NeedCldDataFile)
+
+// Informs the renderer process that Compact Language Detector (CLD) data is
+// available and provides an IPC::PlatformFileForTransit obtained from
+// IPC::GetFileHandleForProcess(...)
+// This message is sent by a DataFileBrowserCldDataProvider to a
+// DataFileRendererCldDataProvider.
+IPC_MESSAGE_ROUTED3(ChromeViewMsg_CldDataFileAvailable,
+                    IPC::PlatformFileForTransit /* ipc_file_handle */,
+                    uint64 /* data_offset */,
+                    uint64 /* data_length */)