implement sign in dialog

chrome/browser/extensions/api/identity/identity_api.h

Index: chrome/browser/extensions/api/identity/identity_api.h
===================================================================
--- chrome/browser/extensions/api/identity/identity_api.h	(revision 146190)
+++ chrome/browser/extensions/api/identity/identity_api.h	(working copy)
@@ -13,6 +13,7 @@
 #include "chrome/browser/extensions/app_notify_channel_setup.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "chrome/common/net/gaia/oauth2_mint_token_flow.h"
 
 class GoogleServiceAuthError;
@@ -21,7 +22,8 @@
 
 class GetAuthTokenFunction : public AsyncExtensionFunction,
                              public OAuth2MintTokenFlow::Delegate,
-                             public ExtensionInstallPrompt::Delegate {
+                             public ExtensionInstallPrompt::Delegate,
+                             public LoginUIService::Observer {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.identity.getAuthToken");
 
@@ -35,17 +37,30 @@
 
   // OAuth2MintTokenFlow::Delegate implementation:
   virtual void OnMintTokenSuccess(const std::string& access_token) OVERRIDE;
-  virtual void OnMintTokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
+  virtual void OnMintTokenFailure(
+      const GoogleServiceAuthError& error) OVERRIDE;
   virtual void OnIssueAdviceSuccess(
       const IssueAdviceInfo& issue_advice) OVERRIDE;
 
+  // LoginUIService::Observer implementation.
+  virtual void OnLoginUIShown(LoginUIService::LoginUI* ui) OVERRIDE;
+  virtual void OnLoginUIClosed(LoginUIService::LoginUI* ui) OVERRIDE;
+
   // ExtensionInstallPrompt::Delegate implementation:
   virtual void InstallUIProceed() OVERRIDE;
   virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
 
+  // Shows the login UI in a browser popup.
+  bool StartLogin();
   // Starts a MintTokenFlow with the given mode; Returns success.
   bool StartFlow(OAuth2MintTokenFlow::Mode mode);
 
+  // Checks if there is a master login token to mint token for the extension.
+  bool HasLoginToken() const;
+
+  // Gets the token mint flow mode based on a command-line flag.
+  OAuth2MintTokenFlow::Mode GetTokenFlowMode() const;
+
   bool interactive_;
   scoped_ptr<OAuth2MintTokenFlow> flow_;