[iOS] Adds TestFullscreenController functionality.

This class now supports:
- enabling/disabling a FullscreenModel,
- sending broadcast values,
- and notifying observers of service shutdown.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I6d0b6964599aee1606dd992577ddc43d4ce43a4d
Reviewed-on: https://chromium-review.googlesource.com/1185977
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585657}

ios/chrome/browser/ui/fullscreen/test/BUILD.gn

@@ -20,6 +20,8 @@ source_set("test") {
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
+    "//base",
+    "//ios/chrome/browser/ui/broadcaster",
     "//ios/chrome/browser/ui/fullscreen",
     "//ios/chrome/browser/ui/fullscreen:internal",
     "//ios/chrome/browser/ui/fullscreen:ui",

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

@@ -7,10 +7,14 @@
 
 #import "ios/chrome/browser/ui/fullscreen/fullscreen_controller.h"
 
+#include "base/observer_list.h"
+
 class FullscreenModel;
 
-// Test version of FullscreenController that enables and disabled the
-// FullscreenModel passed on initialization.
+// Test version of FullscreenController with limited functionality:
+// - Enables/disables a FullscreenModel.
+// - Exposes a broadcaster.
+// - Supports FullscreenControllerObserver::FullscreenControllerWillShutDown().
 class TestFullscreenController : public FullscreenController {
  public:
   explicit TestFullscreenController(FullscreenModel* model);
@@ -27,9 +31,16 @@ class TestFullscreenController : public FullscreenController {
   CGFloat GetProgress() const override;
   void ResetModel() override;
 
+  // KeyedService:
+  void Shutdown() override;
+
  private:
   // The model.
-  FullscreenModel* model_;
+  FullscreenModel* model_ = nullptr;
+  // The broadcaster.
+  ChromeBroadcaster* broadcaster_ = nil;
+  // The observers.
+  base::ObserverList<FullscreenControllerObserver>::Unchecked observers_;
 };
 
 #endif  // IOS_CHROME_BROWSER_UI_FULLSCREEN_TEST_TEST_FULLSCREEN_CONTROLLER_H_

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

@@ -4,6 +4,8 @@
 
 #import "ios/chrome/browser/ui/fullscreen/test/test_fullscreen_controller.h"
 
+#import "ios/chrome/browser/ui/broadcaster/chrome_broadcaster.h"
+#import "ios/chrome/browser/ui/fullscreen/fullscreen_controller_observer.h"
 #import "ios/chrome/browser/ui/fullscreen/fullscreen_model.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -11,38 +13,53 @@
 #endif
 
 TestFullscreenController::TestFullscreenController(FullscreenModel* model)
-    : FullscreenController(), model_(model) {}
+    : FullscreenController(),
+      model_(model),
+      broadcaster_([[ChromeBroadcaster alloc] init]) {}
 
 TestFullscreenController::~TestFullscreenController() = default;
 
 ChromeBroadcaster* TestFullscreenController::broadcaster() {
-  return nil;
+  return broadcaster_;
 }
 
 void TestFullscreenController::SetWebStateList(WebStateList* web_state_list) {}
 
 void TestFullscreenController::AddObserver(
-    FullscreenControllerObserver* observer) {}
+    FullscreenControllerObserver* observer) {
+  observers_.AddObserver(observer);
+}
 
 void TestFullscreenController::RemoveObserver(
-    FullscreenControllerObserver* observer) {}
+    FullscreenControllerObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
 
 bool TestFullscreenController::IsEnabled() const {
-  return model_->enabled();
+  return model_ && model_->enabled();
 }
 
 void TestFullscreenController::IncrementDisabledCounter() {
-  model_->IncrementDisabledCounter();
+  if (model_)
+    model_->IncrementDisabledCounter();
 }
 
 void TestFullscreenController::DecrementDisabledCounter() {
-  model_->DecrementDisabledCounter();
+  if (model_)
+    model_->DecrementDisabledCounter();
 }
 
 CGFloat TestFullscreenController::GetProgress() const {
-  return model_->progress();
+  return model_ ? model_->progress() : 0.0;
 }
 
 void TestFullscreenController::ResetModel() {
-  model_->ResetForNavigation();
+  if (model_)
+    model_->ResetForNavigation();
+}
+
+void TestFullscreenController::Shutdown() {
+  for (auto& observer : observers_) {
+    observer.FullscreenControllerWillShutDown(this);
+  }
 }