add CrosDisplayConnection to assistant

Bug: 807015
Test: None
Change-Id: I6b9ae265f6105dc7160f041b7e752785180889f3
Reviewed-on: https://chromium-review.googlesource.com/941389Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Muyuan Li <muyuanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540251}

chromeos/services/assistant/DEPS

 include_rules = [
+  "+chromeos/assistant",
   "+google_apis/gaia",
   "+libassistant",
   "+mojo/public",

chromeos/services/assistant/assistant_manager_service_impl.cc

@@ -31,6 +31,7 @@ void AssistantManagerServiceImpl::Start(const std::string& access_token) {
   assistant_manager_internal_->SetOptions(*internal_options, [](bool success) {
     DVLOG(2) << "set options: " << success;
   });
+  assistant_manager_internal_->SetDisplayConnection(&display_connection_);
 
   // By default AssistantManager will not start listening for its hotword until
   // we explicitly set EnableListening() to |true|.

chromeos/services/assistant/assistant_manager_service_impl.h

@@ -10,6 +10,7 @@
 
 // TODO(xiaohuic): replace with "base/macros.h" once we remove
 // libassistant/contrib dependency.
+#include "chromeos/assistant/internal/cros_display_connection.h"
 #include "chromeos/services/assistant/assistant_manager_service.h"
 #include "chromeos/services/assistant/platform_api_impl.h"
 #include "libassistant/contrib/core/macros.h"
@@ -33,6 +34,7 @@ class AssistantManagerServiceImpl : public AssistantManagerService {
   void SetAccessToken(const std::string& access_token) override;
 
  private:
+  CrosDisplayConnection display_connection_;
   PlatformApiImpl platform_api_;
   std::unique_ptr<assistant_client::AssistantManager> assistant_manager_;
   assistant_client::AssistantManagerInternal* const assistant_manager_internal_;