Adds methods for Cast support to ios::ChromeBrowserProvider.

ios/public/provider/chrome/browser/chrome_browser_provider.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 
 #include <CoreGraphics/CoreGraphics.h>
 #import <Foundation/Foundation.h>
 #include <stddef.h>
@@ skipping 14 matching lines @@
 
 namespace autofill {
 class CardUnmaskPromptController;
 class CardUnmaskPromptView;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
+namespace web {
+class WebState;
+}
+
 namespace sync_sessions {
 class SyncedWindowDelegatesGetter;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 @protocol AppRatingPrompt;
 @protocol InfoBarViewProtocol;
@@ skipping 67 matching lines @@
       const GURL& page_url,
       const std::vector<int>& desired_sizes_in_pixel,
       const favicon_base::FaviconResultsCallback& callback) const;
   // Creates and returns a new styled text field with the given |frame|.
   virtual UITextField<TextFieldStyling>* CreateStyledTextField(
       CGRect frame) const NS_RETURNS_RETAINED;
   // Creates and returns an app ratings prompt object.  Can return nil if app
   // ratings prompts are not supported by the provider.
   virtual id<AppRatingPrompt> CreateAppRatingPrompt() const NS_RETURNS_RETAINED;
 
+  // Initializes the cast service.  Should be called soon after the given
+  // |tab_model| is created.
+  // TODO(rohitrao): Change from |id| to |TabModel*| once TabModel is moved into
+  // the Chromium tree.
+  virtual void InitializeCastService(id tab_model) const;

[Olivier, 2016/10/06 09:26:45]

The name suggests that this will be called only once, and not once per
tab_model.

[rohitrao (ping after 24h), 2016/10/06 12:07:42]

Looking at the callsites, this is only ever called once.

I could rename the argument to |main_tab_model|, to try and make it clearer
(because we only ever create one main tab model).

+
+  // Adds Cast Sender API support to the given |web_state|, if it is supported
+  // by this embedder.
+  virtual void AddCastAPISupportToWebState(web::WebState* web_state,
+                                           NSString* tab_id) const;
+
   // Returns whether safe browsing is enabled. See the comment on
   // metrics_services_manager_client.h for details on |on_update_callback|.
   virtual bool IsSafeBrowsingEnabled(const base::Closure& on_update_callback);
 
   // Returns the SyncedWindowDelegatesGetter implementation.
   virtual std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_