Add tests for panel app icon functionaility.

chrome/browser/ui/panels/base_panel_browser_test.h

Index: chrome/browser/ui/panels/base_panel_browser_test.h
diff --git a/chrome/browser/ui/panels/base_panel_browser_test.h b/chrome/browser/ui/panels/base_panel_browser_test.h
index c211d423b23511653c3d68efefa1dae0ccf7e6cb..703ccb79f7129542d12476a0040f1f210cf40658 100644
--- a/chrome/browser/ui/panels/base_panel_browser_test.h
+++ b/chrome/browser/ui/panels/base_panel_browser_test.h
@@ -82,12 +82,15 @@ class BasePanelBrowserTest : public InProcessBrowserTest {
 
   void WaitForPanelActiveState(Panel* panel, ActiveState state);
   void WaitForWindowSizeAvailable(Panel* panel);
+  void WaitForAppIconAvailable(Panel* panel);
   void WaitForBoundsAnimationFinished(Panel* panel);
 
   scoped_refptr<extensions::Extension> CreateExtension(
       const FilePath::StringType& path,
       extensions::Extension::Location location,
       const DictionaryValue& extra_value);
+  scoped_refptr<extensions::Extension> LoadExtensionFromManifest(
+      const FilePath::StringType& manifest_file);
 
   void MoveMouseAndWaitForExpansionStateChange(Panel* panel,
                                                const gfx::Point& position);