Add policy for fullscreen mode; disallow fullscreen in public sessions

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index 3dc36128b8d0e7af09bed7c51b57865978e66dc1..51436899f4d3933766fb310562481844fcef94e7 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -1787,6 +1787,21 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, FileURLBlacklist) {
   CheckURLIsBlocked(browser(), file_path2.c_str());
 }
 
+IN_PROC_BROWSER_TEST_F(PolicyTest, AllowFullscreen) {
+  PolicyMap policies;
+  policies.Set(key::kAllowFullscreen,
+               POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
+               base::Value::CreateBooleanValue(false), NULL);
+  UpdateProviderPolicy(policies);
+
+  BrowserWindow* browser_window = browser()->window();
+  ASSERT_TRUE(browser_window);
+
+  EXPECT_FALSE(browser_window->IsFullscreen());
+  chrome::ToggleFullscreenMode(browser());
+  EXPECT_FALSE(browser_window->IsFullscreen());
+}
+
 #if defined(OS_CHROMEOS)
 IN_PROC_BROWSER_TEST_F(PolicyTest, DisableScreenshotsFile) {
   int screenshot_count = CountScreenshots();