dPWA: Implement launch_internal automated testing action.

This change also adds a basic test to verify the action.

Bug: 1156349
Change-Id: Ic1f0f331e72029cd8bb95368d525bc27c3e247a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580485
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836209}

chrome/browser/ui/views/web_apps/web_app_integration_browsertest.cc

@@ -107,14 +107,21 @@ class WebAppIntegrationBrowserTest : public InProcessBrowserTest {
     run_loop.Run();
 
     chrome::SetAutoAcceptPWAInstallConfirmationForTesting(false);
+    app_id_ = app_id;
 
     return app_id;
   }
 
+  Browser* LaunchInternal() {
+    return LaunchWebAppBrowserAndWait(ProfileManager::GetActiveUserProfile(),
+                                      app_id_);
+  }
+
  protected:
   PageActionIconView* pwa_install_view() { return pwa_install_view_; }
 
  private:
+  AppId app_id_;
   net::EmbeddedTestServer https_server_;
   PageActionIconView* pwa_install_view_ = nullptr;
 };
@@ -143,4 +150,11 @@ IN_PROC_BROWSER_TEST_F(WebAppIntegrationBrowserTest,
             kEnabled);
 }
 
+IN_PROC_BROWSER_TEST_F(WebAppIntegrationBrowserTest, LaunchInternal) {
+  NavigateToSite(browser(), GetInstallableAppURL());
+  ExecutePwaInstallIcon();
+  Browser* app_browser = LaunchInternal();
+  DCHECK(app_browser);
+}
+
 }  // namespace web_app