[iOS Clean] Created OverlayService.

ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm

Index: ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
index 6198cab7d5b55770b97724151373fdd9f7165066..af3bc51138c33c1dc6d9161b1cfc9f89a3b3fa68 100644
--- a/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/web_contents/web_coordinator.mm
@@ -7,8 +7,10 @@
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #import "ios/clean/chrome/browser/ui/commands/context_menu_commands.h"
+#import "ios/clean/chrome/browser/ui/commands/web_overlay_commands.h"
 #import "ios/clean/chrome/browser/ui/context_menu/context_menu_context_impl.h"
 #import "ios/clean/chrome/browser/ui/context_menu/web_context_menu_coordinator.h"
+#import "ios/clean/chrome/browser/ui/web_contents/overlays/web_overlay_queue.h"
 #import "ios/clean/chrome/browser/ui/web_contents/web_contents_mediator.h"
 #import "ios/clean/chrome/browser/ui/web_contents/web_contents_view_controller.h"
 #import "ios/shared/chrome/browser/ui/browser_list/browser.h"
@@ -22,11 +24,21 @@
 #error "This file requires ARC support."
 #endif
 
-@interface WebCoordinator ()<ContextMenuCommands, CRWWebStateDelegate> {
+@interface WebCoordinator ()<ContextMenuCommands,
+                             CRWWebStateDelegate,
+                             WebOverlayPresentationCommands> {
   std::unique_ptr<web::WebStateDelegateBridge> _webStateDelegate;
 }
 @property(nonatomic, strong) WebContentsViewController* viewController;
 @property(nonatomic, strong) WebContentsMediator* mediator;
+
+// Lazily creates a WebJavaScriptDialogPresenter and WebOverlayQueue for the
+// WebState.
+- (void)createDialogHelpers;
+
+// Starts the next overlay in |webState|'s WebOverlayQueue.
+- (void)startNextWebOverlay;
+
 @end
 
 @implementation WebCoordinator
@@ -50,13 +62,21 @@ - (void)setWebState:(web::WebState*)webState {
 }
 
 - (void)start {
+  // Create the view controller and start it.
   self.viewController = [[WebContentsViewController alloc] init];
   self.mediator.consumer = self.viewController;
   self.mediator.webStateList = &self.browser->web_state_list();
   [super start];
+  // Register for overlay commands and start the next overlay.
+  [self.browser->dispatcher()
+      startDispatchingToTarget:self
+                   forProtocol:@protocol(WebOverlayPresentationCommands)];
+  [self createDialogHelpers];
+  [self startNextWebOverlay];
 }
 
 - (void)stop {
+  [self.browser->dispatcher() stopDispatchingToTarget:self];
   [super stop];
   [self.mediator disconnect];
 }
@@ -114,4 +134,25 @@ - (BOOL)webState:(web::WebState*)webState
   return YES;
 }
 
+#pragma mark - WebOverlayPresentationCommands
+
+- (void)startNextWebOverlayForWebState:(web::WebState*)webState {
+  DCHECK_EQ(self.webState, webState);
+  [self startNextWebOverlay];
+}
+
+#pragma mark -
+
+- (void)createDialogHelpers {
+  id<WebOverlaySchedulerCommands> overlayDispatcher =
+      static_cast<id<WebOverlaySchedulerCommands>>(self.browser->dispatcher());
+  WebOverlayQueue::CreateForWebState(self.webState, overlayDispatcher);
+}
+
+- (void)startNextWebOverlay {
+  WebOverlayQueue* queue = WebOverlayQueue::FromWebState(self.webState);
+  if (queue->HasQueuedOverlays() && !queue->IsShowingOverlay())
+    queue->StartNextOverlay(self);
+}
+
 @end