Add policy for fullscreen mode; disallow fullscreen in public sessions

This CL adds a user policy that determines whether fullscreen mode is
allowed and uses it to disallow fullscreen mode in public sessions.

BUG=275405
TEST=New browser tests

Review URL: https://chromiumcodereview.appspot.com/22986010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219482 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 26 insertions, 0 deletions

diff --git a/apps/pref_names.cc b/apps/pref_names.cc
index 02b652c..2ca3a4a 100644
--- a/apps/pref_names.cc
+++ b/apps/pref_names.cc
@@ -8,6 +8,10 @@ namespace apps {
 
 namespace prefs {
 
+// A boolean that tracks whether apps are allowed to enter fullscreen mode.
+extern const char kAppFullscreenAllowed[] =
+    "apps.fullscreen.allowed";
+
 // A boolean that tracks whether the user has ever enabled the app launcher.
 const char kAppLauncherHasBeenEnabled[] =
     "apps.app_launcher.has_been_enabled";
diff --git a/apps/pref_names.h b/apps/pref_names.h
index 55af7d0..6a03b861 100644
--- a/apps/pref_names.h
+++ b/apps/pref_names.h
@@ -10,6 +10,7 @@ namespace prefs {
 
 // Alphabetical list of preference names specific to Apps component.
 // Keep alphabetized and document each one in the source file.
+extern const char kAppFullscreenAllowed[];
 extern const char kAppLauncherHasBeenEnabled[];
 extern const char kAppLauncherIsEnabled[];
 extern const char kAppLauncherShortcutVersion[];
diff --git a/apps/prefs.cc b/apps/prefs.cc
index 9347783..d53be17 100644
--- a/apps/prefs.cc
+++ b/apps/prefs.cc
@@ -38,6 +38,12 @@ void RegisterPrefs(PrefRegistrySimple* registry) {
 }
 
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
+#if !defined(OS_MACOSX)
+  registry->RegisterBooleanPref(
+      prefs::kAppFullscreenAllowed, true,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+#endif
+
   // Indicates whether app shortcuts have been created.
   registry->RegisterBooleanPref(
       prefs::kShortcutsHaveBeenCreated, false,
diff --git a/apps/shell_window.cc b/apps/shell_window.cc
index 425adf6..96c6abd 100644
--- a/apps/shell_window.cc
+++ b/apps/shell_window.cc
@@ -37,6 +37,11 @@
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/screen.h"
 
+#if !defined(OS_MACOSX)
+#include "apps/pref_names.h"
+#include "base/prefs/pref_service.h"
+#endif
+
 using content::ConsoleMessageLevel;
 using content::WebContents;
 using extensions::APIPermission;
@@ -494,6 +499,16 @@ void ShellWindow::NavigationStateChanged(
 
 void ShellWindow::ToggleFullscreenModeForTab(content::WebContents* source,
                                              bool enter_fullscreen) {
+#if !defined(OS_MACOSX)
+  // Do not enter fullscreen mode if disallowed by pref.
+  // TODO(bartfab): Add a test once it becomes possible to simulate a user
+  // gesture. http://crbug.com/174178
+  if (enter_fullscreen &&
+      !profile()->GetPrefs()->GetBoolean(prefs::kAppFullscreenAllowed)) {
+    return;
+  }
+#endif
+
   if (!IsExtensionWithPermissionOrSuggestInConsole(
       APIPermission::kFullscreen,
       extension_,