Implement CWVWebView.scrollView.

ios/web_view/internal/cwv_web_view.mm

 // Copyright 2014 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/web_view/public/cwv_web_view.h"
 
 #include <memory>
 #include <utility>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "google_apis/google_api_keys.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/reload_type.h"
 #import "ios/web/public/web_state/context_menu_params.h"
 #import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/ui/crw_web_delegate.h"
+#import "ios/web/public/web_state/ui/crw_web_view_proxy.h"
+#import "ios/web/public/web_state/ui/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_delegate_bridge.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #import "ios/web_view/internal/cwv_html_element_internal.h"
 #import "ios/web_view/internal/cwv_navigation_action_internal.h"
+#import "ios/web_view/internal/cwv_scroll_view_internal.h"
 #import "ios/web_view/internal/cwv_web_view_configuration_internal.h"
 #import "ios/web_view/internal/translate/web_view_translate_client.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 #import "ios/web_view/internal/web_view_java_script_dialog_presenter.h"
 #import "ios/web_view/internal/web_view_web_state_policy_decider.h"
 #import "ios/web_view/public/cwv_navigation_delegate.h"
 #import "ios/web_view/public/cwv_ui_delegate.h"
 #import "ios/web_view/public/cwv_web_view_configuration.h"
 #import "net/base/mac/url_conversions.h"
 #include "ui/base/page_transition_types.h"
@@ skipping 43 matching lines @@
 
 static NSString* gUserAgentProduct = nil;
 
 @implementation CWVWebView
 
 @synthesize configuration = _configuration;
 @synthesize navigationDelegate = _navigationDelegate;
 @synthesize translationDelegate = _translationDelegate;
 @synthesize estimatedProgress = _estimatedProgress;
 @synthesize UIDelegate = _UIDelegate;
+@synthesize scrollView = _scrollView;
 
 + (NSString*)userAgentProduct {
   return gUserAgentProduct;
 }
 
 + (void)setUserAgentProduct:(NSString*)product {
   gUserAgentProduct = [product copy];
 }
 
 + (void)setGoogleAPIKey:(NSString*)googleAPIKey
                clientID:(NSString*)clientID
            clientSecret:(NSString*)clientSecret {
   google_apis::SetAPIKey(base::SysNSStringToUTF8(googleAPIKey));
 
   std::string clientIDString = base::SysNSStringToUTF8(clientID);
   std::string clientSecretString = base::SysNSStringToUTF8(clientSecret);
   for (size_t i = 0; i < google_apis::CLIENT_NUM_ITEMS; ++i) {
     google_apis::OAuth2Client client =
         static_cast<google_apis::OAuth2Client>(i);
     google_apis::SetOAuth2ClientID(client, clientIDString);
     google_apis::SetOAuth2ClientSecret(client, clientSecretString);
   }
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
                 configuration:(CWVWebViewConfiguration*)configuration {
   self = [super initWithFrame:frame];
   if (self) {
     _configuration = [configuration copy];
+    _scrollView = [[CWVScrollView alloc] init];
     [self resetWebStateWithSessionStorage:nil];
   }
   return self;
 }
 
 - (BOOL)canGoBack {
   return _webState && _webState->GetNavigationManager()->CanGoBack();
 }
 
 - (BOOL)canGoForward {
@@ skipping 207 matching lines @@
   _webState->SetDelegate(_webStateDelegate.get());
 
   _webStatePolicyDecider =
       base::MakeUnique<ios_web_view::WebViewWebStatePolicyDecider>(
           _webState.get(), self);
 
   _javaScriptDialogPresenter =
       base::MakeUnique<ios_web_view::WebViewJavaScriptDialogPresenter>(self,
                                                                        nullptr);
 
+  _scrollView.proxy = _webState.get()->GetWebViewProxy().scrollViewProxy;
+
   // Initialize Translate.
   ios_web_view::WebViewTranslateClient::CreateForWebState(_webState.get());
 
   [self addInternalWebViewAsSubview];
 }
 
 // Adds the web view provided by |_webState| as a subview unless it has already.
 - (void)addInternalWebViewAsSubview {
   UIView* subview = _webState->GetView();
   if (subview.superview == self) {
     return;
   }
   subview.frame = self.bounds;
   subview.autoresizingMask =
       UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
   [self addSubview:subview];
 }
 
 @end