Added basic browser test for window.print() from Chrome apps.

This just tests the success of the call to window.print(). It does not
test whether the call leads to a print preview window and ultimately to
a printout. It will be extended over time to provide additional coverage
of the print functionality.

BUG=NONE

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=220467

Review URL: https://chromiumcodereview.appspot.com/23054002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220542 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/apps/app_browsertest.cc

@@ -31,6 +31,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/api/app_runtime.h"
 #include "chrome/common/pref_names.h"
@@ -1036,6 +1037,24 @@ IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, MAYBE_WebContentsHasFocus) {
       GetRenderWidgetHostView()->HasFocus());
 }
 
+// Currently this test only works if the PDF preview plug-in is available. This
+// will only happen in Chrome release builds or if the plug-in has been manually
+// copied from a Chrome release build. In the former case, this test will run
+// automatically. In the later case, it can be run manually by commenting out
+// the next three lines and the corresponding #endif and then running
+// browser_tests with a --enable-print-preview flag.
+#if !defined(GOOGLE_CHROME_BUILD)
+#define MAYBE_WindowDotPrintWorks DISABLED_WindowDotPrintWorks
+#else
+#define MAYBE_WindowDotPrintWorks WindowDotPrintWorks
+#endif
+
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, MAYBE_WindowDotPrintWorks) {
+  PrintPreviewUI::SetAutoCancelForTesting(true);
+  ASSERT_TRUE(RunPlatformAppTest("platform_apps/print_api")) << message_;
+  PrintPreviewUI::SetAutoCancelForTesting(false);
+}
+
 
 #if defined(OS_CHROMEOS)
 

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

@@ -520,8 +520,12 @@ void PrintPreviewUI::OnPreviewDataIsAvailable(int expected_pages_count,
   }
   base::FundamentalValue ui_identifier(id_);
   base::FundamentalValue ui_preview_request_id(preview_request_id);
-  web_ui()->CallJavascriptFunction("updatePrintPreview", ui_identifier,
-                                   ui_preview_request_id);
+  if (AutoCancelForTesting()) {
+    OnClosePrintPreviewDialog();
+  } else {
+    web_ui()->CallJavascriptFunction("updatePrintPreview", ui_identifier,
+                                     ui_preview_request_id);
+  }
 }
 
 void PrintPreviewUI::OnPrintPreviewDialogDestroyed() {
@@ -582,3 +586,13 @@ void PrintPreviewUI::OnReloadPrintersList() {
 void PrintPreviewUI::OnPrintPreviewScalingDisabled() {
   web_ui()->CallJavascriptFunction("printScalingDisabledForSourcePDF");
 }
+
+static bool g_auto_cancel_for_testing_ = false;
+
+void PrintPreviewUI::SetAutoCancelForTesting(bool auto_cancel) {
+  g_auto_cancel_for_testing_ = auto_cancel;
+}
+
+bool PrintPreviewUI::AutoCancelForTesting() {
+  return g_auto_cancel_for_testing_;
+}

chrome/browser/ui/webui/print_preview/print_preview_ui.h

@@ -147,6 +147,10 @@ class PrintPreviewUI : public ConstrainedWebDialogUI {
   // default.
   void OnPrintPreviewScalingDisabled();
 
+  // Manages the global auto-cancel mode used only for testing.
+  static void SetAutoCancelForTesting(bool auto_cancel);
+  static bool AutoCancelForTesting();
+
  private:
   friend class PrintPreviewHandlerTest;
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest, StickyMarginsCustom);

chrome/test/data/extensions/platform_apps/print_api/manifest.json

+{
+  "name": "Platform App Test: window.print() API",
+  "version": "1",
+  "app": {
+    "background": {
+      "scripts": [
+        "test.js"
+      ]
+    }
+  }
+}

chrome/test/data/extensions/platform_apps/print_api/test.html

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chrome/test/data/extensions/platform_apps/print_api/test.js

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.runTests([
+    function testWindowDotPrintCallWorks() {
+      chrome.app.window.create('test.html', {}, chrome.test.callbackPass(
+          function(appWindow) {
+            appWindow.contentWindow.onload = chrome.test.callbackPass(
+                function() {
+                  appWindow.contentWindow.print();
+                });
+          }));
+    }
+  ]);
+});