cros: Pass gaia_auth init params via postMessage.

chrome/browser/extensions/signin/gaia_auth_extension_loader.h

Index: chrome/browser/extensions/signin/gaia_auth_extension_loader.h
diff --git a/chrome/browser/extensions/signin/gaia_auth_extension_loader.h b/chrome/browser/extensions/signin/gaia_auth_extension_loader.h
index 20fd46482a3e8fc338f7868e1ef895e6b42f409c..146596e11691145ac9532c4686a9fcd85bdb4c43 100644
--- a/chrome/browser/extensions/signin/gaia_auth_extension_loader.h
+++ b/chrome/browser/extensions/signin/gaia_auth_extension_loader.h
@@ -5,7 +5,10 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_SIGNIN_GAIA_AUTH_EXTENSION_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_SIGNIN_GAIA_AUTH_EXTENSION_LOADER_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <map>
+#include <string>
+
+#include "base/macros.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 
 namespace content {
@@ -29,6 +32,15 @@ class GaiaAuthExtensionLoader : public BrowserContextKeyedAPI {
   // Unload the gaia auth extension if no pending reference.
   void UnloadIfNeeded();
 
+  // Add a string data for gaia auth extension. Returns an ID that
+  // could be used to get the data. All strings are cleared when gaia auth
+  // is unloaded.
+  int AddData(const std::string& data);
+
+  // Get data for the given ID. Returns true if the data is found and
+  // its value is copied to |data|. Otherwise, returns false.
+  bool GetData(int data_id, std::string* data);
+
   static GaiaAuthExtensionLoader* Get(content::BrowserContext* context);
 
   // BrowserContextKeyedAPI implementation.
@@ -50,6 +62,9 @@ class GaiaAuthExtensionLoader : public BrowserContextKeyedAPI {
   content::BrowserContext* browser_context_;
   int load_count_;
 
+  int last_data_id_;
+  std::map<int, std::string> data_;
+
   DISALLOW_COPY_AND_ASSIGN(GaiaAuthExtensionLoader);
 };