Add navigator.doNotTrack property

chrome/browser/do_not_track_browsertest.cc

Index: chrome/browser/do_not_track_browsertest.cc
diff --git a/chrome/browser/do_not_track_browsertest.cc b/chrome/browser/do_not_track_browsertest.cc
index f1b391d4391b75eb371b074a6ba7d3261c7ff515..acaafc71e960170dad87d41de1f466bc7079c815 100644
--- a/chrome/browser/do_not_track_browsertest.cc
+++ b/chrome/browser/do_not_track_browsertest.cc
@@ -11,6 +11,8 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
 
 typedef InProcessBrowserTest DoNotTrackTest;
 
@@ -53,3 +55,32 @@ IN_PROC_BROWSER_TEST_F(DoNotTrackTest, Redirect) {
 
   EXPECT_EQ(1, matches);
 }
+
+// Check that the DOM property is set when the corresponding preference is set.
+IN_PROC_BROWSER_TEST_F(DoNotTrackTest, DOMProperty) {
+  PrefService* prefs = browser()->profile()->GetPrefs();
+  prefs->SetBoolean(prefs::kEnableDoNotTrack, true);
+
+  ASSERT_NO_FATAL_FAILURE(content::WaitForLoadStop(
+      chrome::GetActiveWebContents(browser())));
+
+  std::string do_not_track;
+  EXPECT_TRUE(content::ExecuteJavaScriptAndExtractString(
+      chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
+      std::wstring(),
+      L"window.domAutomationController.send(navigator.doNotTrack)",
+      &do_not_track));
+  EXPECT_EQ("1", do_not_track);
+
+  // Reset flag and check that the changed value is propagated to the existing
+  // renderer.
+  prefs->SetBoolean(prefs::kEnableDoNotTrack, false);
+
+  EXPECT_TRUE(content::ExecuteJavaScriptAndExtractString(
+      chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
+      std::wstring(),
+      L"window.domAutomationController.send("
+      L"navigator.doNotTrack === null ? '0' : '1')",
+      &do_not_track));
+  EXPECT_EQ("0", do_not_track);
+}