Adds PrintingContext implementation stub for Android.

chrome/browser/printing/printing_message_filter.cc

Index: chrome/browser/printing/printing_message_filter.cc
diff --git a/chrome/browser/printing/printing_message_filter.cc b/chrome/browser/printing/printing_message_filter.cc
index 35b4074328de8ba4ec5e2cdce26e9c18c0654bf4..afaac36d606bda4a69c5dadee189e816789269ed 100644
--- a/chrome/browser/printing/printing_message_filter.cc
+++ b/chrome/browser/printing/printing_message_filter.cc
@@ -32,6 +32,10 @@
 #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 {
@@ -100,6 +104,11 @@ void PrintingMessageFilter::OverrideThreadForMessage(
       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
 }
 
@@ -110,7 +119,7 @@ bool PrintingMessageFilter::OnMessageReceived(const IPC::Message& message,
 #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,
@@ -141,9 +150,12 @@ void PrintingMessageFilter::OnDuplicateSection(
 }
 #endif
 
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 void PrintingMessageFilter::OnAllocateTempFileForPrinting(
-    base::FileDescriptor* temp_file_fd, int* sequence_number) {
+    int render_view_id,
+    base::FileDescriptor* temp_file_fd,
+    int* sequence_number) {
+#if defined(OS_CHROMEOS)
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   temp_file_fd->fd = *sequence_number = -1;
   temp_file_fd->auto_close = false;
@@ -166,10 +178,19 @@ void PrintingMessageFilter::OnAllocateTempFileForPrinting(
       }
     }
   }
+#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);
+  temp_file_fd->auto_close = false;

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

You probably want this set to true? If not, can you explain why it needs to be
false?

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

The file descriptor is created in & passed from Android side, and it will handle
the closing.

+  temp_file_fd->fd = print_view_manager->GetFileDescriptor().fd;
+#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);
@@ -185,8 +206,11 @@ void PrintingMessageFilter::OnTempFileForPrintingWritten(int render_view_id,
 
   // Erase the entry in the map.
   map->erase(it);
+#endif

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

Are you going to handle the TempFileForPrintingWritten msg on Android at all? If
yes, add:

#elif defined(OS_ANDROID)
NOTIMPLEMENTED();

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

Done.

 }
+#endif  // defined(OS_CHROMEOS) || defined(OS_ANDROID)
 
+#if defined(OS_CHROMEOS)
 void PrintingMessageFilter::CreatePrintDialogForFile(
     int render_view_id,
     const base::FilePath& path) {