Add UMA to count the number of Google CAPTCHA pages shown and solved by users.

components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc

Index: components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc
diff --git a/components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc b/components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc
index de5431f8f1e43b2c86523cc5b6def588104a4667..a61f585862e12f97d932edb82788615cfcd0399b 100644
--- a/components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc
+++ b/components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc
@@ -7,10 +7,12 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/process/kill.h"
 #include "base/test/histogram_tester.h"
+#include "base/test/user_action_tester.h"
 #include "base/time/time.h"
 #include "components/page_load_metrics/common/page_load_metrics_messages.h"
 #include "components/rappor/rappor_utils.h"
 #include "components/rappor/test_rappor_service.h"
+#include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/test/test_renderer_host.h"
@@ -97,6 +99,7 @@ class MetricsWebContentsObserverTest
 
  protected:
   base::HistogramTester histogram_tester_;
+  base::UserActionTester user_action_tester_;
   rappor::TestRapporService rappor_tester_;
   scoped_ptr<MetricsWebContentsObserver> observer_;
 
@@ -676,4 +679,23 @@ TEST_F(MetricsWebContentsObserverTest, RapporQuickPageLoad) {
   EXPECT_EQ(0u, flag_it->second);
 }
 
+TEST_F(MetricsWebContentsObserverTest, IsGoogleCaptcha) {
+  struct {
+    std::string url;
+    bool expected;
+  } test_cases[] = {
+      {"", false},
+      {"http://www.google.com/", false},
+      {"http://www.cnn.com/", false},
+      {"http://ipv4.google.com/", false},
+      {"https://ipv4.google.com/sorry/IndexRedirect?continue=http://a", true},
+      {"https://ipv6.google.com/sorry/IndexRedirect?continue=http://a", true},
+      {"https://ipv7.google.com/sorry/IndexRedirect?continue=http://a", false},
+  };
+  for (const auto& test : test_cases) {
+    EXPECT_EQ(test.expected, IsGoogleCaptcha(GURL(test.url)))
+        << "for URL: " << test.url;
+  }
+}
+
 }  // namespace page_load_metrics