Add option to open PDFs in system viewer to OS X and Linux.

chrome/browser/download/download_shelf_context_menu.cc

Index: chrome/browser/download/download_shelf_context_menu.cc
diff --git a/chrome/browser/download/download_shelf_context_menu.cc b/chrome/browser/download/download_shelf_context_menu.cc
index 81d7a4ebf3311d77a53bf6956957b7d4823b17af..f81bddcef735a57ec7f6f790da7a507ff00204e8 100644
--- a/chrome/browser/download/download_shelf_context_menu.cc
+++ b/chrome/browser/download/download_shelf_context_menu.cc
@@ -128,6 +128,12 @@ bool DownloadShelfContextMenu::IsCommandIdChecked(int command_id) const {
             download_item_->GetBrowserContext());
         return prefs->ShouldOpenPdfInAdobeReader();
       }
+#elif defined(OS_MACOSX) || defined(OS_LINUX)
+      if (CanOpenPdfInReader()) {
+        DownloadPrefs* prefs = DownloadPrefs::FromBrowserContext(
+            download_item_->GetBrowserContext());
+        return prefs->ShouldOpenPdfInSystemReader();
+      }
 #endif
       return download_item_->ShouldOpenFileBasedOnExtension();
     case TOGGLE_PAUSE:
@@ -168,6 +174,13 @@ void DownloadShelfContextMenu::ExecuteCommand(int command_id, int event_flags) {
             is_checked);
         break;
       }
+#elif defined(OS_MACOSX) || defined(OS_LINUX)
+      if (CanOpenPdfInReader()) {
+        prefs->SetShouldOpenPdfInSystemReader(!is_checked);
+        DownloadItemModel(download_item_).SetShouldPreferOpeningInBrowser(
+            is_checked);
+        break;
+      }
 #endif
       base::FilePath path = download_item_->GetTargetFilePath();
       if (is_checked)
@@ -388,17 +401,26 @@ int DownloadShelfContextMenu::GetAlwaysOpenStringId() const {
 #if defined(OS_WIN)
   if (CanOpenPdfInReader())
     return IDS_DOWNLOAD_MENU_ALWAYS_OPEN_PDF_IN_READER;
+#elif defined(OS_MACOSX) || defined(OS_LINUX)
+  if (CanOpenPdfInReader())
+    return IDS_DOWNLOAD_MENU_PLATFORM_OPEN_ALWAYS;
 #endif
   return IDS_DOWNLOAD_MENU_ALWAYS_OPEN_TYPE;
 }
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
 bool DownloadShelfContextMenu::IsDownloadPdf() const {
   base::FilePath path = download_item_->GetTargetFilePath();
   return path.MatchesExtension(FILE_PATH_LITERAL(".pdf"));
 }
+#endif
 
+#if defined(OS_WIN)
 bool DownloadShelfContextMenu::CanOpenPdfInReader() const {
   return (is_pdf_reader_up_to_date_ && IsDownloadPdf());
 }
+#elif defined(OS_MACOSX) || defined(OS_LINUX)
+bool DownloadShelfContextMenu::CanOpenPdfInReader() const {
+  return IsDownloadPdf();
+}
 #endif