gdata: Fix "save as pdf" to work on Google Drive.

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index 66009cba46129547c7b38beca918586eb25c8814..181de07bb8a66524d3fea018d0be1a011dc8a908 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -59,6 +59,10 @@
 #include "printing/print_settings.h"
 #include "unicode/ulocdata.h"
 
+#ifdef OS_CHROMEOS
+#include "chrome/browser/chromeos/gdata/gdata_util.h"
+#endif
+
 #if !defined(OS_MACOSX)
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
@@ -213,6 +217,22 @@ void PrintToPdfCallback(Metafile* metafile, const FilePath& path) {
       base::Bind(&base::DeletePointer<Metafile>, metafile));
 }
 
+#ifdef OS_CHROMEOS
+void PrintToPdfCallbackWithCheck(Metafile* metafile,
+                                 gdata::GDataFileError error,
+                                 const FilePath& path) {
+  if (error != gdata::GDATA_FILE_OK) {
+    LOG(ERROR) << "Save to pdf failed to write: " << error;
+  } else {
+    metafile->SaveTo(path);
+  }
+  // |metafile| must be deleted on the UI thread.
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&base::DeletePointer<Metafile>, metafile));
+}
+#endif
+
 static base::LazyInstance<printing::StickySettings> sticky_settings =
     LAZY_INSTANCE_INITIALIZER;
 
@@ -911,9 +931,18 @@ void PrintPreviewHandler::PostPrintToPdfTask(base::RefCountedBytes* data) {
   printing::PreviewMetafile* metafile = new printing::PreviewMetafile;
   metafile->InitFromData(static_cast<const void*>(data->front()), data->size());
   // PrintToPdfCallback takes ownership of |metafile|.
+#ifdef OS_CHROMEOS
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  gdata::util::PrepareWritableFileAndRun(
+      Profile::FromBrowserContext(preview_web_contents()->GetBrowserContext()),
+      *print_to_pdf_path_,
+      base::Bind(&PrintToPdfCallbackWithCheck, metafile));
+#else
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
                           base::Bind(&PrintToPdfCallback, metafile,
                                      *print_to_pdf_path_));
+#endif
+
   print_to_pdf_path_.reset();
   ActivateInitiatorTabAndClosePreviewTab();
 }