Use cast http connection in libassistant.

Bug: b:118193766
Test: Manual

Change-Id: Ia0cd58e42761b35b9f7281344266505074d59936
Reviewed-on: https://chromium-review.googlesource.com/c/1321956
Commit-Queue: Yilei Li <yileili@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607318}

chromeos/services/assistant/assistant_manager_service_impl.cc

@@ -107,6 +107,7 @@ AssistantManagerServiceImpl::AssistantManagerServiceImpl(
     network::NetworkConnectionTracker* network_connection_tracker)
     : action_module_(std::make_unique<action::CrosActionModule>(this)),
       main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      chromium_api_delegate_(),
       assistant_settings_manager_(
           std::make_unique<AssistantSettingsManagerImpl>(this)),
       display_connection_(std::make_unique<CrosDisplayConnection>(this)),
@@ -786,6 +787,8 @@ AssistantManagerServiceImpl::StartAssistantInternal(
   assistant_manager_internal->SetDisplayConnection(display_connection_.get());
   assistant_manager_internal->RegisterActionModule(action_module_.get());
   assistant_manager_internal->SetAssistantManagerDelegate(this);
+  assistant_manager_internal->GetFuchsiaApiHelperOrDie()->SetFuchsiaApiDelegate(
+      &chromium_api_delegate_);
   assistant_manager->AddConversationStateListener(this);
   assistant_manager->AddDeviceStateListener(this);
 

chromeos/services/assistant/assistant_manager_service_impl.h

@@ -19,6 +19,7 @@
 #include "chromeos/assistant/internal/internal_util.h"
 #include "chromeos/services/assistant/assistant_manager_service.h"
 #include "chromeos/services/assistant/assistant_settings_manager_impl.h"
+#include "chromeos/services/assistant/chromium_api_delegate.h"
 #include "chromeos/services/assistant/platform_api_impl.h"
 #include "chromeos/services/assistant/public/mojom/assistant.mojom.h"
 #include "libassistant/shared/internal_api/assistant_manager_delegate.h"
@@ -212,6 +213,7 @@ class AssistantManagerServiceImpl
   std::unique_ptr<PlatformApiImpl> platform_api_;
   std::unique_ptr<action::CrosActionModule> action_module_;
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+  ChromiumApiDelegate chromium_api_delegate_;
   std::unique_ptr<assistant_client::AssistantManager> assistant_manager_;
   std::unique_ptr<AssistantSettingsManagerImpl> assistant_settings_manager_;
   // same ownership as assistant_manager_.