Implement window.print() on Android

chrome/common/print_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 printing.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 389 matching lines @@
 // in resulting PdfMetafileSkia in printing.
 IPC_SYNC_MESSAGE_CONTROL1_2(PrintHostMsg_AllocateTempFileForPrinting,
                             int /* render_view_id */,
                             base::FileDescriptor /* temp file fd */,
                             int /* fd in browser*/) // Used only by Chrome OS.
 IPC_MESSAGE_CONTROL2(PrintHostMsg_TempFileForPrintingWritten,
                      int /* render_view_id */,
                      int /* fd in browser */) // Used only by Chrome OS.
 #endif
 
+#if defined(OS_ANDROID)
+IPC_SYNC_MESSAGE_ROUTED1_0(PrintHostMsg_InitiateAndroidPrint,
+                           int /* cookie */ )
+#endif
+
 // Asks the browser to do print preview.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_RequestPrintPreview,
                     PrintHostMsg_RequestPrintPreview_Params /* params */)
 
 // Notify the browser the number of pages in the print preview document.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_DidGetPreviewPageCount,
                     PrintHostMsg_DidGetPreviewPageCount_Params /* params */)
 
 // Notify the browser of the default page layout according to the currently
 // selected printer and page size.
@@ skipping 47 matching lines @@
 IPC_SYNC_MESSAGE_ROUTED0_0(PrintHostMsg_SetupScriptedPrintPreview)
 
 // Tell the browser to show the print preview, when the document is sufficiently
 // loaded such that the renderer can determine whether it is modifiable or not.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_ShowScriptedPrintPreview,
                     bool /* is_modifiable */)
 
 // Notify the browser to set print presets based on source PDF document.
 IPC_MESSAGE_ROUTED1(PrintHostMsg_SetOptionsFromDocument,
                     PrintHostMsg_SetOptionsFromDocument_Params /* params */)