Implement some methods of ChromeBrowserState.

ios/chrome/browser/browser_state/chrome_browser_state.cc

Index: ios/chrome/browser/browser_state/chrome_browser_state.cc
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state.cc b/ios/chrome/browser/browser_state/chrome_browser_state.cc
index 2926e02144042ff8ec16b72e16f10ff919842e64..adb23337f1f3dbc316f602db554211953ab148bc 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state.cc
+++ b/ios/chrome/browser/browser_state/chrome_browser_state.cc
@@ -4,12 +4,28 @@
 
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 
+#include <utility>
+
 #include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/sequenced_task_runner.h"
+#include "components/prefs/json_pref_store.h"
+#include "components/syncable_prefs/pref_service_syncable.h"
+#include "ios/chrome/browser/chrome_url_constants.h"
+#include "ios/chrome/browser/net/ios_chrome_url_request_context_getter.h"
+#include "ios/chrome/browser/net/net_types.h"
 #include "ios/public/provider/web/web_ui_ios.h"
 #include "ios/web/public/web_state/web_state.h"
+#include "ios/web/public/web_thread.h"
+#include "ios/web/webui/url_data_manager_ios_backend.h"
+#include "net/url_request/url_request_interceptor.h"
 
 namespace ios {
 
+ChromeBrowserState::ChromeBrowserState() {}
+
+ChromeBrowserState::~ChromeBrowserState() {}
+
 // static
 ChromeBrowserState* ChromeBrowserState::FromBrowserState(
     web::BrowserState* browser_state) {
@@ -33,4 +49,34 @@ std::string ChromeBrowserState::GetDebugName() {
   return name;
 }
 
+scoped_refptr<base::SequencedTaskRunner> ChromeBrowserState::GetIOTaskRunner() {
+  base::FilePath browser_state_path =
+      GetOriginalChromeBrowserState()->GetStatePath();
+  return JsonPrefStore::GetTaskRunnerForFile(browser_state_path,
+                                             web::WebThread::GetBlockingPool());
+}
+
+syncable_prefs::PrefServiceSyncable* ChromeBrowserState::GetSyncablePrefs() {
+  return static_cast<syncable_prefs::PrefServiceSyncable*>(GetPrefs());
+}
+
+TestChromeBrowserState* ChromeBrowserState::AsTestChromeBrowserState() {
+  return nullptr;
+}
+
+net::URLRequestContextGetter* ChromeBrowserState::GetRequestContext() {
+  DCHECK_CURRENTLY_ON_WEB_THREAD(web::WebThread::UI);
+  if (!request_context_getter_) {
+    ProtocolHandlerMap protocol_handlers;
+    protocol_handlers[kChromeUIScheme] =
+        linked_ptr<net::URLRequestJobFactory::ProtocolHandler>(
+            web::URLDataManagerIOSBackend::CreateProtocolHandler(this)
+                .release());
+    URLRequestInterceptorScopedVector request_interceptors;
+    request_context_getter_ = make_scoped_refptr(CreateRequestContext(
+        &protocol_handlers, std::move(request_interceptors)));
+  }
+  return request_context_getter_.get();
+}
+
 }  // namespace ios