Add tests for panel app icon functionaility.

chrome/browser/ui/cocoa/panels/panel_cocoa.mm

Index: chrome/browser/ui/cocoa/panels/panel_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/panels/panel_cocoa.mm b/chrome/browser/ui/cocoa/panels/panel_cocoa.mm
index 18346bbfa46e043b386c078046b8687059bed93e..ebc340fb17f40151f7a67ae953699e4f95cd973f 100644
--- a/chrome/browser/ui/cocoa/panels/panel_cocoa.mm
+++ b/chrome/browser/ui/cocoa/panels/panel_cocoa.mm
@@ -290,6 +290,7 @@ class CocoaNativePanelTesting : public NativePanelTesting {
   virtual void FinishDragTitlebar() OVERRIDE;
   virtual bool VerifyDrawingAttention() const OVERRIDE;
   virtual bool VerifyActiveState(bool is_active) OVERRIDE;
+  virtual bool VerifyAppIcon() const OVERRIDE;
   virtual bool IsWindowSizeKnown() const OVERRIDE;
   virtual bool IsAnimatingBounds() const OVERRIDE;
   virtual bool IsButtonVisible(
@@ -357,6 +358,11 @@ bool CocoaNativePanelTesting::VerifyActiveState(bool is_active) {
   return false;
 }
 
+bool CocoaNativePanelTesting::VerifyAppIcon() const {
+// Nothing to do since panel does not show dock icon.
+  return true;
+}
+
 bool CocoaNativePanelTesting::IsWindowSizeKnown() const {
   return true;
 }