Fix FullscreenController tests with simplified-fullscreen-ui flag.

chrome/browser/ui/exclusive_access/mouse_lock_controller.h

Index: chrome/browser/ui/exclusive_access/mouse_lock_controller.h
diff --git a/chrome/browser/ui/exclusive_access/mouse_lock_controller.h b/chrome/browser/ui/exclusive_access/mouse_lock_controller.h
index 924e8bba312b78b622b169de0a8216d35d7f2b16..e451f6bcede58517d16086806e71e958af69212b 100644
--- a/chrome/browser/ui/exclusive_access/mouse_lock_controller.h
+++ b/chrome/browser/ui/exclusive_access/mouse_lock_controller.h
@@ -35,6 +35,14 @@ class MouseLockController : public ExclusiveAccessControllerBase {
 
   void UnlockMouse();
 
+  // If true, does not call into the WebContents to lock the mouse. Just assumes
+  // that it works. This may be necessary when calling
+  // Browser::RequestToLockMouse in tests, because the proper signal will not
+  // have been passed to the RenderViewHost.
+  void set_fake_mouse_lock_for_test(bool value) {
+    fake_mouse_lock_for_test_ = value;
+  }
+
  private:
   enum MouseLockState {
     MOUSELOCK_NOT_REQUESTED,
@@ -56,6 +64,8 @@ class MouseLockController : public ExclusiveAccessControllerBase {
 
   MouseLockState mouse_lock_state_;
 
+  bool fake_mouse_lock_for_test_;
+
   DISALLOW_COPY_AND_ASSIGN(MouseLockController);
 };