Add tests for panel app icon functionaility.

chrome/browser/ui/gtk/panels/panel_gtk.cc

Index: chrome/browser/ui/gtk/panels/panel_gtk.cc
diff --git a/chrome/browser/ui/gtk/panels/panel_gtk.cc b/chrome/browser/ui/gtk/panels/panel_gtk.cc
index 268b6fac2e766ae36866ab7b8fe0f91655769c53..44b579efc7bb091c9354549d1940e7e9f3316fe9 100644
--- a/chrome/browser/ui/gtk/panels/panel_gtk.cc
+++ b/chrome/browser/ui/gtk/panels/panel_gtk.cc
@@ -1028,6 +1028,7 @@ class GtkNativePanelTesting : public NativePanelTesting {
   virtual void FinishDragTitlebar() OVERRIDE;
   virtual bool VerifyDrawingAttention() const OVERRIDE;
   virtual bool VerifyActiveState(bool is_active) OVERRIDE;
+  virtual bool VerifyAppIcon() const OVERRIDE;
   virtual void WaitForWindowCreationToComplete() const OVERRIDE;
   virtual bool IsWindowSizeKnown() const OVERRIDE;
   virtual bool IsAnimatingBounds() const OVERRIDE;
@@ -1111,6 +1112,13 @@ bool GtkNativePanelTesting::VerifyActiveState(bool is_active) {
   return false;
 }
 
+bool GtkNativePanelTesting::VerifyAppIcon() const {
+  GdkPixbuf* icon = gtk_window_get_icon(panel_gtk_->GetNativePanelHandle());
+  return icon &&
+         gdk_pixbuf_get_width(icon) == panel::kPanelAppIconSize &&
+         gdk_pixbuf_get_height(icon) == panel::kPanelAppIconSize;
+}
+
 void GtkNativePanelTesting::WaitForWindowCreationToComplete() const {
   while (GetFrameSize().IsEmpty())
     MessageLoopForUI::current()->RunAllPending();