Fix windowed NPAPI plugins covering up dialogs on Win Aura.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc
===================================================================
--- chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc	(revision 233351)
+++ chrome/browser/ui/webui/print_preview/print_preview_ui_browsertest.cc	(working copy)
@@ -3,17 +3,29 @@
 // found in the LICENSE file.
 
 #include "base/command_line.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
+#include "chrome/browser/content_settings/host_content_settings_map.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_navigation_observer.h"
 #include "content/public/test/test_utils.h"
 
+#if defined(OS_WIN) && defined(USE_AURA)
+#include "content/public/browser/web_contents_view.h"
+#include "ui/aura/root_window.h"
+#endif
+
 namespace {
 
 class PrintPreviewTest : public InProcessBrowserTest {
@@ -65,4 +77,63 @@
   ASSERT_TRUE(chrome::IsCommandEnabled(browser(), IDC_ADVANCED_PRINT));
 }
 
+#if defined(OS_WIN) && defined(USE_AURA)
+
+BOOL CALLBACK EnumerateChildren(HWND hwnd, LPARAM l_param) {
+  HWND* child = reinterpret_cast<HWND*>(l_param);
+  *child = hwnd;
+  // The first child window is the plugin, then its children. So stop
+  // enumerating after the first callback.
+  return FALSE;
+}
+
+// This test verifies that constrained windows aren't covered by windowed NPAPI
+// plugins. The code which fixes this is in WebContentsViewAura::WindowObserver.
+IN_PROC_BROWSER_TEST_F(PrintPreviewTest, WindowedNPAPIPluginHidden) {
+  browser()->profile()->GetPrefs()->SetBoolean(prefs::kPluginsAlwaysAuthorize,
+                                               true);
+
+  // First load the page and wait for the NPAPI plugin's window to display.
+  string16 expected_title(ASCIIToUTF16("ready"));
+  content::WebContents* tab =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  content::TitleWatcher title_watcher(tab, expected_title);
+
+  GURL url = ui_test_utils::GetTestUrl(
+      base::FilePath().AppendASCII("printing"),
+      base::FilePath().AppendASCII("npapi_plugin.html"));
+  ui_test_utils::NavigateToURL(browser(), url);
+
+  EXPECT_EQ(expected_title, title_watcher.WaitAndGetTitle());
+
+  // Now get the region of the plugin before and after the print preview is
+  // shown. They should be different.
+  HWND hwnd =
+      tab->GetView()->GetNativeView()->GetDispatcher()->GetAcceleratedWidget();
+  HWND child = NULL;
+  EnumChildWindows(hwnd, EnumerateChildren,reinterpret_cast<LPARAM>(&child));
+
+  RECT region_before, region_after;
+  int result = GetWindowRgnBox(child, &region_before);
+  ASSERT_EQ(result, SIMPLEREGION);
+
+  // Now print preview.
+  Print();
+
+  result = GetWindowRgnBox(child, &region_after);
+  if (result == NULLREGION) {
+    // Depending on the browser window size, the plugin could be full covered.
+    return;
+  }
+
+  ASSERT_EQ(result, SIMPLEREGION);
+  bool rects_equal =
+      region_before.left == region_after.left &&
+      region_before.top == region_after.top &&
+      region_before.right == region_after.right &&
+      region_before.bottom == region_after.bottom;
+  ASSERT_FALSE(rects_equal);
+}
+#endif
+
 }  // namespace