Revert "Revert 29457, because this is making ExtensionBrowserTest.PageAction crash on Vista"

chrome/browser/gtk/location_bar_view_gtk.cc

Index: chrome/browser/gtk/location_bar_view_gtk.cc
diff --git a/chrome/browser/gtk/location_bar_view_gtk.cc b/chrome/browser/gtk/location_bar_view_gtk.cc
index e36c8d3abc10d69c0c5037cb58d3751fd58bc6f8..3183ede0313e57fc80c12dcb9ac15aa49e171ed2 100644
--- a/chrome/browser/gtk/location_bar_view_gtk.cc
+++ b/chrome/browser/gtk/location_bar_view_gtk.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "app/gfx/canvas_paint.h"
 #include "app/gfx/gtk_util.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ -684,6 +685,8 @@ LocationBarViewGtk::PageActionViewGtk::PageActionViewGtk(
   gtk_event_box_set_visible_window(GTK_EVENT_BOX(event_box_.get()), FALSE);
   g_signal_connect(event_box_.get(), "button-press-event",
                    G_CALLBACK(&OnButtonPressed), this);
+  g_signal_connect_after(event_box_.get(), "expose-event",
+                         G_CALLBACK(OnExposeEvent), this);
 
   image_.Own(gtk_image_new());
   gtk_container_add(GTK_CONTAINER(event_box_.get()), image_.get());
@@ -793,3 +796,20 @@ gboolean LocationBarViewGtk::PageActionViewGtk::OnButtonPressed(
       event->button);
   return true;
 }
+
+// static
+gboolean LocationBarViewGtk::PageActionViewGtk::OnExposeEvent(
+    GtkWidget* widget, GdkEventExpose* event, PageActionViewGtk* view) {
+  TabContents* contents = view->owner_->browser_->GetSelectedTabContents();
+  if (!contents)
+    return FALSE;
+  const ExtensionActionState* state =
+      contents->GetPageActionState(view->page_action_);
+  if (!state || state->badge_text().empty())
+    return FALSE;
+
+  gfx::CanvasPaint canvas(event, false);
+  gfx::Rect bounding_rect(widget->allocation);
+  state->PaintBadge(&canvas, bounding_rect);
+  return FALSE;
+}