Show "About panel" bubble on Windows.

chrome/browser/ui/panels/panel_browser_frame_view.cc

Index: chrome/browser/ui/panels/panel_browser_frame_view.cc
===================================================================
--- chrome/browser/ui/panels/panel_browser_frame_view.cc	(revision 85006)
+++ chrome/browser/ui/panels/panel_browser_frame_view.cc	(working copy)
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/panels/panel_browser_frame_view.h"
 
 #include "chrome/browser/themes/theme_service.h"
+#include "chrome/browser/ui/panels/about_panel_bubble.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_browser_view.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
@@ -354,7 +355,12 @@
 }
 
 bool PanelBrowserFrameView::IsCommandIdEnabled(int command_id) const {
-  // All the menu options are always enabled.
+  // If the panel originator is not provided, disable "About this panel".
+  // Currently this is not possible.
+  if (command_id == COMMAND_ABOUT && !browser_view_->panel()->originator()) {
+    NOTREACHED();
+    return false;
+  }
   return true;
 }
 
@@ -374,9 +380,17 @@
     case COMMAND_CLOSE_ALL:
       browser_view_->panel()->manager()->RemoveAllActive();
       break;
-    case COMMAND_ABOUT:
-      NOTIMPLEMENTED();
+    case COMMAND_ABOUT: {
+      gfx::Point origin(options_button_->bounds().origin());
+      views::View::ConvertPointToScreen(this, &origin);
+      AboutPanelBubble::Show(
+          GetWidget(),
+          gfx::Rect(origin, options_button_->bounds().size()),
+          BubbleBorder::BOTTOM_RIGHT,
+          GetFaviconForTabIconView(),
+          browser_view_->panel()->originator());
       break;
+    }
     default:
       NOTREACHED();
       break;