Add download item tooltips on linux/win.

chrome/browser/views/download_item_view.cc

Index: chrome/browser/views/download_item_view.cc
diff --git a/chrome/browser/views/download_item_view.cc b/chrome/browser/views/download_item_view.cc
index 31278130c9634082c173489be7f8beb91dbc2c4e..fbb0dd84d62af2c731b433636756679a92db0057 100644
--- a/chrome/browser/views/download_item_view.cc
+++ b/chrome/browser/views/download_item_view.cc
@@ -211,6 +211,7 @@ DownloadItemView::DownloadItemView(DownloadItem* download,
   dangerous_mode_body_image_set_ = dangerous_mode_body_image_set;
 
   LoadIcon();
+  tooltip_text_ = download_->GetFileName().value();
 
   font_ = ResourceBundle::GetSharedInstance().GetFont(ResourceBundle::BaseFont);
   box_height_ = std::max<int>(2 * kVerticalPadding + font_.height() +
@@ -240,6 +241,7 @@ DownloadItemView::DownloadItemView(DownloadItem* download,
   drop_hover_animation_.reset(new SlideAnimation(this));
 
   if (download->safety_state() == DownloadItem::DANGEROUS) {
+    tooltip_text_.clear();
     body_state_ = DANGEROUS;
     drop_down_state_ = DANGEROUS;
 
@@ -728,6 +730,7 @@ void DownloadItemView::ClearDangerousMode() {
 
   // We need to load the icon now that the download_ has the real path.
   LoadIcon();
+  tooltip_text_ = download_->GetFileName().value();
 
   // Force the shelf to layout again as our size has changed.
   parent_->Layout();
@@ -924,6 +927,15 @@ void DownloadItemView::LoadIcon() {
                NewCallback(this, &DownloadItemView::OnExtractIconComplete));
 }
 
+bool DownloadItemView::GetTooltipText(const gfx::Point& p,
+                                      std::wstring* tooltip) {
+  if (tooltip_text_.empty())
+    return false;
+
+  tooltip->assign(tooltip_text_);
+  return true;
+}
+
 gfx::Size DownloadItemView::GetButtonSize() {
   DCHECK(save_button_ && discard_button_);
   gfx::Size size;