NOT YET READY: UMA recording the kind of target frame when extensions pierce browsing instance.

chrome/browser/extensions/extension_functional_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 <stddef.h>
 
+#include "base/test/histogram_tester.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
+#include "chrome/browser/metrics/subprocess_metrics_provider.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/test/base/ui_test_utils.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extension_util.h"
 #include "extensions/browser/notification_types.h"
 #include "extensions/browser/test_extension_registry_observer.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 class ExtensionFunctionalTest : public ExtensionBrowserTest {
  public:
   void InstallExtensionSilently(ExtensionService* service,
                                 const char* filename) {
     ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
     size_t num_before = registry->enabled_extensions().size();
 
@@ skipping 116 matching lines @@
         &did_create_popup));
     ASSERT_TRUE(did_create_popup);
     content::WebContents* popup_window = new_window_observer.GetWebContents();
     WaitForLoadStop(popup_window);
     tab1_popup = popup_window->GetMainFrame();
   }
   EXPECT_EQ(GURL(url::kAboutBlankURL), tab1_popup->GetLastCommittedURL());
 
   // Verify that |tab1_popup| can find unrelated frames from the same extension
   // (i.e. that it can find |tab2|.
+  base::HistogramTester histogram_tester;
   std::string location_of_opened_window;
   EXPECT_TRUE(ExecuteScriptAndExtractString(
       tab1_popup,
       "var w = window.open('', 'tab2');\n"
       "window.domAutomationController.send(w.location.href);",
       &location_of_opened_window));
   EXPECT_EQ(tab2->GetLastCommittedURL(), location_of_opened_window);
+
+  // Verify UMA got recorded as expected.
+  SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
+  EXPECT_THAT(histogram_tester.GetAllSamples(
+                  "Extensions.BrowsingInstanceViolation.ExtensionType"),
+              testing::ElementsAre(base::Bucket(Manifest::TYPE_EXTENSION, 1)));
+  EXPECT_THAT(histogram_tester.GetAllSamples(
+                  "Extensions.BrowsingInstanceViolation.ExtensionViewType"),
+              testing::ElementsAre(base::Bucket(VIEW_TYPE_TAB_CONTENTS, 1)));
 }
 
 }  // namespace extensions