Introduced StoreKitTabHelper class

ios/chrome/browser/itunes_links/itunes_links_observer.mm

 // Copyright 2016 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.
 
 #import "ios/chrome/browser/itunes_links/itunes_links_observer.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
-#import "ios/chrome/browser/storekit_launcher.h"
+#import "ios/chrome/browser/store_kit/store_kit_tab_helper.h"
+#import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
-#include "ios/web/public/web_state/web_state.h"
 #include "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface ITunesLinksObserver ()
 
 // If |URL| points to a product on itunes.apple.com, returns the product ID.
 // Otherwise, returns nil.
 // Examples of URLs pointing to products on itunes.apple.com can be found in
 // itunes_links_observer_unittest.mm.
 + (NSString*)productIDFromURL:(const GURL&)URL;
 
 @end
 
 @implementation ITunesLinksObserver {
-  __weak id<StoreKitLauncher> _storeKitLauncher;
+  web::WebState* _webState;
   std::unique_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
 }
 
 - (instancetype)initWithWebState:(web::WebState*)webState {
   self = [super init];
   if (self) {
     _webStateObserverBridge.reset(
         new web::WebStateObserverBridge(webState, self));

[sdefresne, 2017/03/08 02:53:14]

optional: can you change this to use base::MakeUnique<>?

  _webStateObserverBridge = base::MakeUnique<web::WebStateObserverBridge>(
      webState, self);

[pkl (ping after 24h if needed), 2017/03/08 14:27:41]

I'll do a separate CL as this is unrelated to this.

+    _webState = webState;
   }
   return self;
 }
 
-- (instancetype)init {
-  NOTREACHED();
-  return nil;
-}
-
 + (NSString*)productIDFromURL:(const GURL&)URL {
   if (!URL.SchemeIsHTTPOrHTTPS() || !URL.DomainIs("itunes.apple.com"))
     return nil;
   std::string fileName = URL.ExtractFileName();
   // The first 2 characters must be "id", followed by the app ID.
   if (fileName.length() < 3 || fileName.substr(0, 2) != "id")
     return nil;
   std::string productID = fileName.substr(2);
   return base::SysUTF8ToNSString(productID);
 }
 
-#pragma mark - CRWWebStateObserver
+#pragma mark - WebStateObserverBridge
 
 - (void)webState:(web::WebState*)webState didLoadPageWithSuccess:(BOOL)success {
   GURL URL = webState->GetLastCommittedURL();
   NSString* productID = [ITunesLinksObserver productIDFromURL:URL];
-  if (productID)
-    [_storeKitLauncher openAppStore:productID];
+  if (productID) {
+    StoreKitTabHelper* tabHelper = StoreKitTabHelper::FromWebState(_webState);
+    if (tabHelper)
+      tabHelper->OpenAppStore(productID);
+  }
 }
 
 - (void)setStoreKitLauncher:(id<StoreKitLauncher>)storeKitLauncher {
-  _storeKitLauncher = storeKitLauncher;
+  StoreKitTabHelper* tabHelper = StoreKitTabHelper::FromWebState(_webState);
+  if (tabHelper)
+    tabHelper->SetLauncher(storeKitLauncher);
 }
 
 @end