Add tests for panel app icon functionaility.

chrome/browser/ui/panels/panel_browsertest.cc

Index: chrome/browser/ui/panels/panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_browsertest.cc b/chrome/browser/ui/panels/panel_browsertest.cc
index 1f397bebba23989f3890a976e8ef393c9dbcbe3a..96fb50037ceafb2656c2a36d76ce04cca5d3f773 100644
--- a/chrome/browser/ui/panels/panel_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_browsertest.cc
@@ -1689,3 +1689,22 @@ IN_PROC_BROWSER_TEST_F(PanelBrowserTest, MAYBE_Accelerator) {
   signal.Wait();
   EXPECT_EQ(0, panel_manager->num_panels());
 }
+
+// Tests that icon loading might not be completed when the panel is closed.
+// (crbug.com/151484)
+IN_PROC_BROWSER_TEST_F(PanelBrowserTest, ClosePanelBeforeIconLoadingCompleted) {
+  // Create a test extension from the manifest with icons provided.
+  scoped_refptr<Extension> extension = LoadExtensionFromManifest(
+      FILE_PATH_LITERAL("test_extension/manifest.json"));
+  std::string extension_app_name =
+      web_app::GenerateApplicationNameFromExtensionId(extension->id());
+
+  // Create a panel with the extension as host.
+  CreatePanelParams params(extension_app_name, gfx::Rect(), SHOW_AS_INACTIVE);
+  // Do not wait because we want to close the panel before the callback to
+  // signal the icon loading completion is executed.
+  params.wait_for_fully_created = false;
+  Panel* panel = CreatePanelWithParams(params);
+
+  panel->Close();
+}