Support open urls and other operations in multiple windows

The counterpart CL in downstream is
https://chrome-internal-review.googlesource.com/c/chrome/ios_internal/+/3180818

Bug: 1085419
Change-Id: I3e20df0bb93d47009cdaa30896c52c8c648b05a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315432Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791487}

ios/chrome/browser/ui/content_suggestions/content_suggestions_coordinator.mm

@@ -167,11 +167,9 @@
       ReadingListModelFactory::GetForBrowserState(
           self.browser->GetBrowserState());
 
-  self.discoverFeedViewController =
-      ios::GetChromeBrowserProvider()
-          ->GetDiscoverFeedProvider()
-          ->NewFeedViewController(static_cast<id<ApplicationCommands>>(
-              self.browser->GetCommandDispatcher()));
+  self.discoverFeedViewController = ios::GetChromeBrowserProvider()
+                                        ->GetDiscoverFeedProvider()
+                                        ->NewFeedViewController(self.browser);
 
   // TODO(crbug.com/1085419): Once the CollectionView is cleanly exposed, remove
   // this loop.

ios/public/provider/chrome/browser/discover_feed/discover_feed_provider.h

@@ -10,6 +10,7 @@
 #include "base/ios/block_types.h"
 
 @protocol ApplicationCommands;
+class Browser;
 
 // DiscoverFeedProvider allows embedders to provide functionality for a Discover
 // Feed.
@@ -24,8 +25,14 @@ class DiscoverFeedProvider {
   // Returns true if the Discover Feed is enabled.
   virtual bool IsDiscoverFeedEnabled();
   // Returns the Discover Feed ViewController.
+  // Deprecated - use the below NewFeedViewController(Browser* browser) instead.
+  // TODO(crbug.com/1085419): Remove this interface after rolling the downstream
+  // change.
   virtual UIViewController* NewFeedViewController(
       id<ApplicationCommands> handler) NS_RETURNS_RETAINED;
+  // Returns the Discover Feed ViewController.
+  virtual UIViewController* NewFeedViewController(Browser* browser)
+      NS_RETURNS_RETAINED;
   // Updates the feed's theme to match the user's theme (light/dark).
   virtual void UpdateTheme();
   // Refreshes the Discover Feed with completion.

ios/public/provider/chrome/browser/discover_feed/discover_feed_provider.mm

@@ -17,6 +17,11 @@ UIViewController* DiscoverFeedProvider::NewFeedViewController(
   return nil;
 }
 
+UIViewController* DiscoverFeedProvider::NewFeedViewController(
+    Browser* browser) {
+  return nil;
+}
+
 void DiscoverFeedProvider::UpdateTheme() {}
 
 void DiscoverFeedProvider::RefreshFeedWithCompletion(