Windows: Add an "Open in Adobe Reader" menu item for PDF files in the download shelf.

chrome/browser/download/download_prefs.h

Index: chrome/browser/download/download_prefs.h
diff --git a/chrome/browser/download/download_prefs.h b/chrome/browser/download/download_prefs.h
index eca19d3de68444633683b71de1584f86cd433dde..8d3db57d3e675b58c2ea8e401f148cc04d7dcb83 100644
--- a/chrome/browser/download/download_prefs.h
+++ b/chrome/browser/download/download_prefs.h
@@ -73,6 +73,15 @@ class DownloadPrefs {
   // Disables auto-open based on file extension.
   void DisableAutoOpenBasedOnExtension(const base::FilePath& file_name);
 
+#if defined(OS_WIN)
+  // Store the user preference to disk. If |should_open| is true, also disable
+  // the built-in PDF plugin. If |should_open| is false, enable the PDF plugin.
+  void SetShouldOpenPdfInAdobeReader(bool should_open);
+
+  // Return whether the user prefers to open PDF downloads in Adobe Reader.
+  bool ShouldOpenPdfInAdobeReader() const;
+#endif
+
   void ResetAutoOpen();
 
  private:
@@ -94,6 +103,10 @@ class DownloadPrefs {
                    AutoOpenCompareFunctor> AutoOpenSet;
   AutoOpenSet auto_open_;
 
+#if defined(OS_WIN)
+  bool should_open_pdf_in_adobe_reader_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(DownloadPrefs);
 };