Add browser test for WebUI URL logging

chrome/browser/ui/webui/log_web_ui_url_browsertest.cc

Index: chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
diff --git a/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc b/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eaa593e9ea7bb6ad022c17fcddef9ee7580d2e28
--- /dev/null
+++ b/chrome/browser/ui/webui/log_web_ui_url_browsertest.cc
@@ -0,0 +1,54 @@
+// Copyright 2015 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 "chrome/browser/ui/webui/log_web_ui_url.h"
+
+#include <vector>
+
+#include "base/hash.h"
+#include "base/test/histogram_tester.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_commands.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 "testing/gmock/include/gmock/gmock.h"
+#include "url/gurl.h"
+
+using base::Bucket;
+using testing::ElementsAre;
+
+namespace webui {
+
+class LogWebUIUrlTest : public InProcessBrowserTest {
+ public:
+  LogWebUIUrlTest() {}
+  ~LogWebUIUrlTest() override {}
+
+  std::vector<Bucket> GetSamples() {
+    return histogram_tester_.GetAllSamples(webui::kWebUICreatedForUrl);
+  }
+
+ private:
+  base::HistogramTester histogram_tester_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogWebUIUrlTest);
+};
+
+IN_PROC_BROWSER_TEST_F(LogWebUIUrlTest, TestHistoryFrame) {
+  GURL history_frame_url(chrome::kChromeUIHistoryFrameURL);
+
+  ui_test_utils::NavigateToURL(browser(), history_frame_url);
+
+  uint32 history_frame_url_hash = base::Hash(history_frame_url.spec());
+  EXPECT_THAT(GetSamples(), ElementsAre(Bucket(history_frame_url_hash, 1)));
+
+  chrome::Reload(browser(), CURRENT_TAB);
+
+  EXPECT_THAT(GetSamples(), ElementsAre(Bucket(history_frame_url_hash, 2)));
+}
+
+// TODO(dbeam): test an uber page URL like chrome://history.
+
+}  // namespace webui