[iOS] Expose FullscreenController's WebStateList.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Iadcd8c150ab8cf90821f0ea9bef7e71eccf706d6
Reviewed-on: https://chromium-review.googlesource.com/c/1262796
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597237}

ios/chrome/browser/ui/fullscreen/fullscreen_controller.h

@@ -31,10 +31,9 @@ class FullscreenController : public KeyedService {
 
   // The WebStateList for the Browser whose fullscreen state is managed by this
   // controller.
-  // TODO(crbug.com/790886): Once FullscreenController is a BrowserUserData,
-  // remove this, as the Browser's WebStateList can be used directly rather than
-  // being set.
   virtual void SetWebStateList(WebStateList* web_state_list) = 0;
+  virtual const WebStateList* GetWebStateList() const = 0;
+  virtual WebStateList* GetWebStateList() = 0;
 
   // Adds and removes FullscreenControllerObservers.
   virtual void AddObserver(FullscreenControllerObserver* observer) = 0;

ios/chrome/browser/ui/fullscreen/fullscreen_controller_impl.h

@@ -22,6 +22,8 @@ class FullscreenControllerImpl : public FullscreenController {
   // FullscreenController:
   ChromeBroadcaster* broadcaster() override;
   void SetWebStateList(WebStateList* web_state_list) override;
+  const WebStateList* GetWebStateList() const override;
+  WebStateList* GetWebStateList() override;
   void AddObserver(FullscreenControllerObserver* observer) override;
   void RemoveObserver(FullscreenControllerObserver* observer) override;
   bool IsEnabled() const override;

ios/chrome/browser/ui/fullscreen/fullscreen_controller_impl.mm

@@ -59,6 +59,14 @@ void FullscreenControllerImpl::SetWebStateList(WebStateList* web_state_list) {
   web_state_list_observer_.SetWebStateList(web_state_list);
 }
 
+const WebStateList* FullscreenControllerImpl::GetWebStateList() const {
+  return web_state_list_observer_.GetWebStateList();
+}
+
+WebStateList* FullscreenControllerImpl::GetWebStateList() {
+  return web_state_list_observer_.GetWebStateList();
+}
+
 void FullscreenControllerImpl::AddObserver(
     FullscreenControllerObserver* observer) {
   mediator_.AddObserver(observer);

ios/chrome/browser/ui/fullscreen/fullscreen_web_state_list_observer.h

@@ -27,8 +27,10 @@ class FullscreenWebStateListObserver : public WebStateListObserver {
                                  FullscreenMediator* mediator);
   ~FullscreenWebStateListObserver() override;
 
-  // Starts observing |web_state_list|.
+  // The WebStateList being observed.
   void SetWebStateList(WebStateList* web_state_list);
+  const WebStateList* GetWebStateList() const;
+  WebStateList* GetWebStateList();
 
   // Stops observing the the WebStateList.
   void Disconnect();

ios/chrome/browser/ui/fullscreen/fullscreen_web_state_list_observer.mm

@@ -46,6 +46,14 @@ void FullscreenWebStateListObserver::SetWebStateList(
   }
 }
 
+const WebStateList* FullscreenWebStateListObserver::GetWebStateList() const {
+  return web_state_list_;
+}
+
+WebStateList* FullscreenWebStateListObserver::GetWebStateList() {
+  return web_state_list_;
+}
+
 void FullscreenWebStateListObserver::Disconnect() {
   SetWebStateList(nullptr);
 }

ios/chrome/browser/ui/fullscreen/test/test_fullscreen_controller.h

@@ -23,6 +23,8 @@ class TestFullscreenController : public FullscreenController {
   // FullscreenController:
   ChromeBroadcaster* broadcaster() override;
   void SetWebStateList(WebStateList* web_state_list) override;
+  const WebStateList* GetWebStateList() const override;
+  WebStateList* GetWebStateList() override;
   void AddObserver(FullscreenControllerObserver* observer) override;
   void RemoveObserver(FullscreenControllerObserver* observer) override;
   bool IsEnabled() const override;

ios/chrome/browser/ui/fullscreen/test/test_fullscreen_controller.mm

@@ -25,6 +25,14 @@ ChromeBroadcaster* TestFullscreenController::broadcaster() {
 
 void TestFullscreenController::SetWebStateList(WebStateList* web_state_list) {}
 
+const WebStateList* TestFullscreenController::GetWebStateList() const {
+  return nullptr;
+}
+
+WebStateList* TestFullscreenController::GetWebStateList() {
+  return nullptr;
+}
+
 void TestFullscreenController::AddObserver(
     FullscreenControllerObserver* observer) {
   observers_.AddObserver(observer);