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..cfa0f8c991dabe82c87e1cfd4f15bbe6ad3abf0b 100644
--- a/chrome/browser/download/download_prefs.h
+++ b/chrome/browser/download/download_prefs.h
@@ -33,6 +33,12 @@ class DownloadPrefs {
   // Returns the default download directory.
   static const base::FilePath& GetDefaultDownloadDirectory();
 
+#if defined(OS_WIN)
+  // Returns true if it is known that Adobe Reader is up to date as of the
+  // time of the most recent DownloadPrefs creation.
+  static bool IsAdobeReaderUpToDate();
+#endif
+
   // Returns the default download directory for the current profile.
   base::FilePath GetDefaultDownloadDirectoryForProfile() const;
 
@@ -73,11 +79,26 @@ 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:
   void SaveAutoOpenState();
 
+#if defined(OS_WIN)
+  // Update the status of PDF plugins. See comment in
+  // SetShouldOpenPdfInAdobeReader() above.
+  void UpdatePdfPlugins(bool should_open);
+#endif
+
   Profile* profile_;
 
   BooleanPrefMember prompt_for_download_;
@@ -94,6 +115,10 @@ class DownloadPrefs {
                    AutoOpenCompareFunctor> AutoOpenSet;
   AutoOpenSet auto_open_;
 
+#if defined(OS_WIN)
+  bool should_open_pdf_in_adobe_reader_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(DownloadPrefs);
 };