Adds PrintingContext implementation stub for Android.

chrome/browser/printing/printing_message_filter.cc

 // 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.
 
 #include "chrome/browser/printing/printing_message_filter.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 14 matching lines @@
 #if defined(OS_CHROMEOS)
 #include <fcntl.h>
 
 #include <map>
 
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
 #include "chrome/browser/printing/print_dialog_cloud.h"
 #endif
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/printing/print_view_manager_basic.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
 
 #if defined(OS_CHROMEOS)
 typedef std::map<int, base::FilePath> SequenceToPathMap;
 
 struct PrintingSequencePathMap {
   SequenceToPathMap map;
   int sequence;
@@ skipping 48 matching lines @@
 PrintingMessageFilter::~PrintingMessageFilter() {
 }
 
 void PrintingMessageFilter::OverrideThreadForMessage(
     const IPC::Message& message, BrowserThread::ID* thread) {
 #if defined(OS_CHROMEOS)
   if (message.type() == PrintHostMsg_AllocateTempFileForPrinting::ID ||
       message.type() == PrintHostMsg_TempFileForPrintingWritten::ID) {
     *thread = BrowserThread::FILE;
   }
+#elif defined(OS_ANDROID)
+  if (message.type() == PrintHostMsg_AllocateTempFileForPrinting::ID ||
+      message.type() == PrintHostMsg_TempFileForPrintingWritten::ID) {
+    *thread = BrowserThread::UI;
+  }
 #endif
 }
 
 bool PrintingMessageFilter::OnMessageReceived(const IPC::Message& message,
                                               bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(PrintingMessageFilter, message, *message_was_ok)
 #if defined(OS_WIN)
     IPC_MESSAGE_HANDLER(PrintHostMsg_DuplicateSection, OnDuplicateSection)
 #endif
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(PrintHostMsg_AllocateTempFileForPrinting,
                         OnAllocateTempFileForPrinting)
     IPC_MESSAGE_HANDLER(PrintHostMsg_TempFileForPrintingWritten,
                         OnTempFileForPrintingWritten)
 #endif
     IPC_MESSAGE_HANDLER(PrintHostMsg_IsPrintingEnabled, OnIsPrintingEnabled)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_GetDefaultPrintSettings,
                                     OnGetDefaultPrintSettings)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_ScriptedPrint, OnScriptedPrint)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_UpdatePrintSettings,
@@ skipping 10 matching lines @@
 void PrintingMessageFilter::OnDuplicateSection(
     base::SharedMemoryHandle renderer_handle,
     base::SharedMemoryHandle* browser_handle) {
   // Duplicate the handle in this process right now so the memory is kept alive
   // (even if it is not mapped)
   base::SharedMemory shared_buf(renderer_handle, true, PeerHandle());
   shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), browser_handle);
 }
 #endif
 
+#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
+void PrintingMessageFilter::OnAllocateTempFileForPrinting(
+    int render_view_id,
+    base::FileDescriptor* temp_file_fd,
+    int* sequence_number) {
 #if defined(OS_CHROMEOS)
-void PrintingMessageFilter::OnAllocateTempFileForPrinting(
-    base::FileDescriptor* temp_file_fd, int* sequence_number) {
+  // TODO(thestig): Use |render_view_id| for Chrome OS.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   temp_file_fd->fd = *sequence_number = -1;
   temp_file_fd->auto_close = false;
 
   SequenceToPathMap* map = &g_printing_file_descriptor_map.Get().map;
   *sequence_number = g_printing_file_descriptor_map.Get().sequence++;
 
   base::FilePath path;
   if (file_util::CreateTemporaryFile(&path)) {
     int fd = open(path.value().c_str(), O_WRONLY);
     if (fd >= 0) {
       SequenceToPathMap::iterator it = map->find(*sequence_number);
       if (it != map->end()) {
         NOTREACHED() << "Sequence number already in use. seq=" <<
             *sequence_number;
       } else {
         (*map)[*sequence_number] = path;
         temp_file_fd->fd = fd;
         temp_file_fd->auto_close = true;
       }
     }
   }
+#elif defined(OS_ANDROID)
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  content::WebContents* wc = GetWebContentsForRenderView(render_view_id);
+  printing::PrintViewManagerBasic* print_view_manager =
+      printing::PrintViewManagerBasic::FromWebContents(wc);
+  // The file descriptor is originally created in & passed from the Android
+  // side, and it will handle the closing.
+  temp_file_fd->auto_close = false;
+  temp_file_fd->fd = print_view_manager->GetFileDescriptor().fd;

[Lei Zhang, 2013/08/14 18:49:52]

I don't know what the exact lifetime of
|PrintViewManagerBasic::file_descriptor_| is, but you probably should set it to
-1 at some point, here or in OnTempFileForPrintingWritten(), so the same file
descriptor doesn't somehow accidentally get reused.

For instance, if the renderer is misbehaving and asks for a FD twice, you can
deny it on the second attempt because you know on the browser side that you have
already given it the FD.

[cimamoglu1, 2013/08/14 20:38:10]

Done.

+#endif
 }
 
 void PrintingMessageFilter::OnTempFileForPrintingWritten(int render_view_id,
                                                          int sequence_number) {
+#if defined(OS_CHROMEOS)
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   SequenceToPathMap* map = &g_printing_file_descriptor_map.Get().map;
   SequenceToPathMap::iterator it = map->find(sequence_number);
   if (it == map->end()) {
     NOTREACHED() << "Got a sequence that we didn't pass to the "
                     "renderer: " << sequence_number;
     return;
   }
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&PrintingMessageFilter::CreatePrintDialogForFile,
                  this, render_view_id, it->second));
 
   // Erase the entry in the map.
   map->erase(it);
+#elif defined(OS_ANDROID)
+  NOTIMPLEMENTED();

[Lei Zhang, 2013/08/14 18:49:52]

So can you tell me what's going to happen with this? Is the Clank build going to
do something different here, or are you going to add more code here?

[cimamoglu1, 2013/08/14 20:38:10]

I was planning to add more code in the future. Your comment above actually made
me do now = )

+#endif
 }
+#endif  // defined(OS_CHROMEOS) || defined(OS_ANDROID)
 
+#if defined(OS_CHROMEOS)
 void PrintingMessageFilter::CreatePrintDialogForFile(
     int render_view_id,
     const base::FilePath& path) {
   content::WebContents* wc = GetWebContentsForRenderView(render_view_id);
   print_dialog_cloud::CreatePrintDialogForFile(
       wc->GetBrowserContext(),
       wc->GetView()->GetTopLevelNativeWindow(),
       path,
       wc->GetTitle(),
       string16(),
@@ skipping 185 matching lines @@
 
 #if defined(ENABLE_FULL_PRINTING)
 void PrintingMessageFilter::OnCheckForCancel(int32 preview_ui_id,
                                              int preview_request_id,
                                              bool* cancel) {
   PrintPreviewUI::GetCurrentPrintPreviewStatus(preview_ui_id,
                                                preview_request_id,
                                                cancel);
 }
 #endif