Add pause and resume to Linux download shelf.

chrome/browser/download/download_shelf.cc

Index: chrome/browser/download/download_shelf.cc
diff --git a/chrome/browser/download/download_shelf.cc b/chrome/browser/download/download_shelf.cc
index 70db47a0ab715f295ef76f2c2ca4a52e67c00535..f771178e74277cd00335a4141937dba810e8fcf9 100644
--- a/chrome/browser/download/download_shelf.cc
+++ b/chrome/browser/download/download_shelf.cc
@@ -28,13 +28,17 @@ DownloadShelfContextMenu::~DownloadShelfContextMenu() {
 
 bool DownloadShelfContextMenu::ItemIsChecked(int id) const {
   switch (id) {
-    case OPEN_WHEN_COMPLETE:
+    case OPEN_WHEN_COMPLETE: {
       return download_->open_when_complete();
+    }
     case ALWAYS_OPEN_TYPE: {
       const FilePath::StringType extension =
           file_util::GetFileExtensionFromPath(download_->full_path());
       return download_->manager()->ShouldOpenFileExtension(extension);
     }
+    case TOGGLE_PAUSE: {
+      return download_->is_paused();
+    }
   }
   return false;
 }