Adding fullscreen mode access to chrome.fileBrowserPrivate API.

chrome/browser/extensions/extension_file_browser_private_api.cc

Index: chrome/browser/extensions/extension_file_browser_private_api.cc
diff --git a/chrome/browser/extensions/extension_file_browser_private_api.cc b/chrome/browser/extensions/extension_file_browser_private_api.cc
index e2473b2960f803edaacd40f7360881ae1a082a73..aa7478f5b42ec42a2d15625b7bdf4e1ba494a338 100644
--- a/chrome/browser/extensions/extension_file_browser_private_api.cc
+++ b/chrome/browser/extensions/extension_file_browser_private_api.cc
@@ -26,6 +26,7 @@
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/views/select_file_dialog_extension.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
 #include "chrome/common/chrome_switches.h"
@@ -1694,3 +1695,21 @@ bool FileDialogStringsFunction::RunImpl() {
 
   return true;
 }
+
+bool ToggleFullscreenFunction::RunImpl() {
+  Browser* browser = GetCurrentBrowser();
+  if (browser) {
+    browser->ToggleFullscreenMode(false);
+  }
+  return true;
+}
+
+// There is no notification to tell us when the user enters/leaves the
+// fullscreen mode using the built-in Chrome controls. All we can do is
+// query the current fullscreen state.
+bool IsFullscreenFunction::RunImpl() {
+  Browser* browser = GetCurrentBrowser();
+  result_.reset(Value::CreateBooleanValue(
+      browser && browser->window() && browser->window()->IsFullscreen()));
+  return true;
+}