Browser Plugin: Enable VisibilityPreservation test

content/browser/browser_plugin/browser_plugin_host_browsertest.cc

 // Copyright (c) 2012 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.
 
 #include "base/command_line.h"
 #include "base/memory/singleton.h"
 #include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
@@ skipping 1038 matching lines @@
   const char* kEmbedderURL = "files/browser_plugin_embedder.html";
   const std::string embedder_code =
       "document.getElementById('plugin').style.visibility = 'hidden'";
   StartBrowserPluginTest(
       kEmbedderURL, kHTMLForGuest, true, embedder_code);
   EXPECT_FALSE(test_guest()->visible());
 }
 
 // This test verifies that if we lose the guest, and get a new one,
 // the new guest will inherit the visibility state of the old guest.
-//
-// Very flaky on Linux, Linux CrOS, somewhat flaky on XP, slightly on
-// Mac; http://crbug.com/162809.
-IN_PROC_BROWSER_TEST_F(BrowserPluginHostTest, DISABLED_VisibilityPreservation) {
+IN_PROC_BROWSER_TEST_F(BrowserPluginHostTest, VisibilityPreservation) {
   const char* kEmbedderURL = "files/browser_plugin_embedder.html";
   StartBrowserPluginTest(kEmbedderURL, kHTMLForGuest, true, "");
   RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
       test_embedder()->web_contents()->GetRenderViewHost());
   // Hide the BrowserPlugin.
   ExecuteSyncJSFunction(rvh, ASCIIToUTF16(
       "document.getElementById('plugin').style.visibility = 'hidden';"));
   test_guest()->WaitUntilHidden();
   // Kill the current guest.
   ExecuteSyncJSFunction(rvh, ASCIIToUTF16(
@@ skipping 164 matching lines @@
                          embedder_code);
   // Check for render view host at position (150, 150) that is outside the
   // bounds of our guest, so this would respond with the render view host of the
   // embedder.
   test_embedder()->WaitForRenderViewHostAtPosition(150, 150);
   ASSERT_EQ(test_embedder()->web_contents()->GetRenderViewHost(),
             test_embedder()->last_rvh_at_position_response());
 }
 
 }  // namespace content