webstorePrivate: Support an |authuser| property in beginInstallWithManifest3.

chrome/browser/extensions/api/webstore_private/webstore_private_api.cc

Index: chrome/browser/extensions/api/webstore_private/webstore_private_api.cc
diff --git a/chrome/browser/extensions/api/webstore_private/webstore_private_api.cc b/chrome/browser/extensions/api/webstore_private/webstore_private_api.cc
index 86523364d12b05943652d0dc5785a03758f2e3f4..653f4a4aa8c0230bf0efa0cc1f788b79ea97d588 100644
--- a/chrome/browser/extensions/api/webstore_private/webstore_private_api.cc
+++ b/chrome/browser/extensions/api/webstore_private/webstore_private_api.cc
@@ -271,10 +271,12 @@ void WebstorePrivateInstallBundleFunction::OnBundleInstallCompleted() {
 }
 
 WebstorePrivateBeginInstallWithManifest3Function::
-    WebstorePrivateBeginInstallWithManifest3Function() {}
+    WebstorePrivateBeginInstallWithManifest3Function() {
+}
 
 WebstorePrivateBeginInstallWithManifest3Function::
-    ~WebstorePrivateBeginInstallWithManifest3Function() {}
+    ~WebstorePrivateBeginInstallWithManifest3Function() {
+}
 
 bool WebstorePrivateBeginInstallWithManifest3Function::RunAsync() {
   params_ = BeginInstallWithManifest3::Params::Create(*args_);
@@ -303,6 +305,10 @@ bool WebstorePrivateBeginInstallWithManifest3Function::RunAsync() {
     }
   }
 
+  if (params_->details.authuser) {
+    authuser_ = *params_->details.authuser;
+  }
+
   std::string icon_data = params_->details.icon_data ?
       *params_->details.icon_data : std::string();
 
@@ -492,6 +498,7 @@ void WebstorePrivateBeginInstallWithManifest3Function::InstallUIProceed() {
   approval->skip_post_install_ui = params_->details.enable_launcher;
   approval->dummy_extension = dummy_extension_;
   approval->installing_icon = gfx::ImageSkia::CreateFrom1xBitmap(icon_);
+  approval->authuser = authuser_;
   g_pending_approvals.Get().PushApproval(approval.Pass());
 
   SetResultCode(ERROR_NONE);