[iOS Clean] Created OverlayService.

ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm

Index: ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm
index 104978959777a314246cb43c5cda533d5725bd58..bd023408e105c898c63073d29d36a85dfa45456d 100644
--- a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm
@@ -20,6 +20,7 @@
 #import "ios/clean/chrome/browser/ui/tab_grid/tab_grid_mediator.h"
 #import "ios/clean/chrome/browser/ui/tab_grid/tab_grid_view_controller.h"
 #import "ios/clean/chrome/browser/ui/tools/tools_coordinator.h"
+#import "ios/clean/chrome/browser/ui/web_contents/overlays/web_overlay_scheduler.h"
 #import "ios/shared/chrome/browser/ui/browser_list/browser.h"
 #import "ios/shared/chrome/browser/ui/commands/command_dispatcher.h"
 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
@@ -43,6 +44,7 @@ @interface TabGridCoordinator ()<ContextMenuCommands,
 @property(nonatomic, weak) TabCoordinator* activeTabCoordinator;
 @property(nonatomic, readonly) WebStateList& webStateList;
 @property(nonatomic, strong) TabGridMediator* mediator;
+@property(nonatomic, strong) WebOverlayScheduler* webOverlayScheduler;
 @end
 
 @implementation TabGridCoordinator
@@ -51,6 +53,7 @@ @implementation TabGridCoordinator
 @synthesize toolsMenuCoordinator = _toolsMenuCoordinator;
 @synthesize activeTabCoordinator = _activeTabCoordinator;
 @synthesize mediator = _mediator;
+@synthesize webOverlayScheduler = _webOverlayScheduler;
 
 #pragma mark - Properties
 
@@ -74,12 +77,23 @@ - (void)start {
 
   self.mediator.consumer = self.viewController;
 
+  id<TabGridCommands, WebOverlayPresentationCommands> schedulerDispatcher =
+      static_cast<id<TabGridCommands, WebOverlayPresentationCommands>>(
+          self.browser->dispatcher());
+  self.webOverlayScheduler =
+      [[WebOverlayScheduler alloc] initWithDispatcher:schedulerDispatcher];
+  [self.browser->dispatcher()
+      startDispatchingToTarget:self.webOverlayScheduler
+                   forProtocol:@protocol(WebOverlaySchedulerCommands)];
+
   [super start];
 }
 
 - (void)stop {
   [super stop];
   [self.browser->dispatcher() stopDispatchingToTarget:self];
+  [self.browser->dispatcher() stopDispatchingToTarget:self.webOverlayScheduler];
+  self.webOverlayScheduler = nil;
   [self.mediator disconnect];
   // PLACEHOLDER: Remove child coordinators here for now. This might be handled
   // differently later on.
@@ -146,6 +160,8 @@ - (void)closeSettings {
 #pragma mark - TabGridCommands
 
 - (void)showTabGridTabAtIndex:(int)index {
+  if (index == self.webStateList.active_index())
+    return;
   self.webStateList.ActivateWebStateAt(index);
   // PLACEHOLDER: The tab coordinator should be able to get the active webState
   // on its own.
@@ -184,6 +200,10 @@ - (void)showTabGrid {
   [self registerForToolsMenuCommands];
 }
 
+- (void)showTabGridTabWithWebState:(const web::WebState*)webState {
+  [self showTabGridTabAtIndex:self.webStateList.GetIndexOfWebState(webState)];
+}
+
 #pragma mark - ToolsMenuCommands
 
 - (void)showToolsMenu {
@@ -240,17 +260,9 @@ - (void)registerForSettingsCommands {
 }
 
 - (void)registerForTabGridCommands {
-  [self.browser->dispatcher() startDispatchingToTarget:self
-                                           forSelector:@selector(showTabGrid)];
-  [self.browser->dispatcher()
-      startDispatchingToTarget:self
-                   forSelector:@selector(showTabGridTabAtIndex:)];
-  [self.browser->dispatcher()
-      startDispatchingToTarget:self
-                   forSelector:@selector(closeTabGridTabAtIndex:)];
   [self.browser->dispatcher()
       startDispatchingToTarget:self
-                   forSelector:@selector(createAndShowNewTabInTabGrid)];
+                   forProtocol:@protocol(TabGridCommands)];
 }
 
 - (void)registerForToolsMenuCommands {