Adds PrintingContext implementation stub for 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 352 matching lines @@
 
 // It's the renderer that controls the printing process when it is generated
 // by javascript. This step is about showing UI to the user to select the
 // final print settings. The output parameter is the same as
 // ViewMsg_PrintPages which is executed implicitly.
 IPC_SYNC_MESSAGE_ROUTED1_1(PrintHostMsg_ScriptedPrint,
                            PrintHostMsg_ScriptedPrint_Params,
                            PrintMsg_PrintPages_Params
                                /* settings chosen by the user*/)
 
-#if defined(USE_X11)
+#if defined(USE_X11) || defined(OS_ANDROID)

[Lei Zhang, 2013/08/13 23:26:37]

BTW, can you change USE_X11 to OS_CHROMEOS?

[cimamoglu1, 2013/08/14 16:10:36]

Done.

 // Asks the browser to create a temporary file for the renderer to fill
 // in resulting NativeMetafile in printing.
-IPC_SYNC_MESSAGE_CONTROL0_2(PrintHostMsg_AllocateTempFileForPrinting,
+IPC_SYNC_MESSAGE_CONTROL1_2(PrintHostMsg_AllocateTempFileForPrinting,
+                            int /* render_view_id */, // Used only by Android.

[Lei Zhang, 2013/08/13 23:26:37]

We can use the RenderView id on CrOS as well. Just leave a TODO(thestig) in
printing_message_filter.cc.

[cimamoglu1, 2013/08/14 16:10:36]

Done.

                             base::FileDescriptor /* temp file fd */,
-                            int /* fd in browser*/)
+                            int /* fd in browser*/) // Used only by Chrome OS.
 IPC_MESSAGE_CONTROL2(PrintHostMsg_TempFileForPrintingWritten,
                      int /* render_view_id */,
-                     int /* fd in browser */)
+                     int /* fd in browser */) // Used only by Chrome OS.
 #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 */)
 
@@ skipping 42 matching lines @@
                     int /* document cookie */)
 
 // Run a nested message loop in the renderer until print preview for
 // window.print() finishes.
 IPC_SYNC_MESSAGE_ROUTED1_0(PrintHostMsg_ScriptedPrintPreview,
                            bool /* is_modifiable */)
 
 // Notify the browser that the PDF in the initiator renderer has disabled print
 // scaling option.
 IPC_MESSAGE_ROUTED0(PrintHostMsg_PrintPreviewScalingDisabled)