[ios] Allow Browser to be passed to create VoiceSearchController

This change will allow Voice search to have access to a Browser in
preparation for classes to be Browser-scoped.

Bug: 790886
Change-Id: Ib80e432e1a84df0c868bcf5b12d4c98138028695
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138169
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757565}

ios/public/provider/chrome/browser/voice/voice_search_provider.h

@@ -13,6 +13,7 @@
 
 @protocol ApplicationCommands;
 class AudioSessionController;
+class Browser;
 class ChromeBrowserState;
 class VoiceSearchController;
 
@@ -33,9 +34,14 @@ class VoiceSearchProvider {
   // Returns the singleton audio session controller.
   virtual AudioSessionController* GetAudioSessionController() const;
 
-  // Creates a new VoiceSearchController object.
+  // Creates a new VoiceSearchController object. TODO(crbug.com/790886): Remove
+  // the ChromeBrowserState constructor when the implementation for the Browser
+  // constructor finishes and all calls use that constructor. This is a part of
+  // the Brower-scoped migration.
   virtual scoped_refptr<VoiceSearchController> CreateVoiceSearchController(
       ChromeBrowserState* browser_state) const;
+  virtual scoped_refptr<VoiceSearchController> CreateVoiceSearchController(
+      Browser* browser) const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VoiceSearchProvider);

ios/public/provider/chrome/browser/voice/voice_search_provider.mm

@@ -27,3 +27,8 @@ VoiceSearchProvider::CreateVoiceSearchController(
     ChromeBrowserState* browser_state) const {
   return scoped_refptr<VoiceSearchController>(nullptr);
 }
+
+scoped_refptr<VoiceSearchController>
+VoiceSearchProvider::CreateVoiceSearchController(Browser* browser) const {
+  return scoped_refptr<VoiceSearchController>(nullptr);
+}