Execute external intents on sceneStateDidHideModalOverlay

The intent is delayed when there is a blocking UI.
It is necessary to execute it after

Bug: 1125091
Change-Id: I434b36a6fa3cd3301452886cedc9898465a3c60f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409300
Auto-Submit: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806959}

ios/chrome/browser/ui/main/scene_controller.mm

@@ -494,11 +494,20 @@ const char kMultiWindowOpenInNewWindowHistogram[] =
                       connectionInformation:self
                          startupInformation:self.mainController
                                browserState:self.currentInterface.browserState];
-  // It is necessary to reset the pendingUserActivity after handling it.
-  // Handle the reset asynchronously to avoid interfering with other observers.
-  dispatch_async(dispatch_get_main_queue(), ^{
-    self.sceneState.pendingUserActivity = nil;
-  });
+  if (sceneIsActive) {
+    // It is necessary to reset the pendingUserActivity after handling it.
+    // Handle the reset asynchronously to avoid interfering with other
+    // observers.
+    dispatch_async(dispatch_get_main_queue(), ^{
+      self.sceneState.pendingUserActivity = nil;
+    });
+  }
+}
+
+- (void)sceneStateDidHideModalOverlay:(SceneState*)sceneState {
+  if (self.sceneState.activationLevel >= SceneActivationLevelForegroundActive) {
+    [self handleExternalIntents];
+  }
 }
 
 #pragma mark - AppStateObserver

ios/chrome/browser/ui/main/scene_state.h

@@ -55,6 +55,8 @@ typedef NS_ENUM(NSUInteger, SceneActivationLevel) {
 - (void)sceneStateWillShowModalOverlay:(SceneState*)sceneState;
 // Notifies when presentingModalOverlay is being set to false.
 - (void)sceneStateWillHideModalOverlay:(SceneState*)sceneState;
+// Notifies when presentingModalOverlay has been set to false.
+- (void)sceneStateDidHideModalOverlay:(SceneState*)sceneState;
 // Notifies when URLContexts have been added to |URLContextsToOpen|.
 - (void)sceneState:(SceneState*)sceneState
     hasPendingURLs:(NSSet<UIOpenURLContext*>*)URLContexts

ios/chrome/browser/ui/main/scene_state.mm

@@ -112,6 +112,10 @@
   }
 
   _presentingModalOverlay = presentingModalOverlay;
+
+  if (!presentingModalOverlay) {
+    [self.observers sceneStateDidHideModalOverlay:self];
+  }
 }
 
 - (void)setURLContextsToOpen:(NSSet<UIOpenURLContext*>*)URLContextsToOpen {