Blimp OAuth2 token retreival on application start up.

chrome/browser/android/blimp/blimp_client_context_factory.cc

Index: chrome/browser/android/blimp/blimp_client_context_factory.cc
diff --git a/chrome/browser/android/blimp/blimp_client_context_factory.cc b/chrome/browser/android/blimp/blimp_client_context_factory.cc
index f070d66dc70599e0bdac4d5e49ebfd7d6a267e2e..6e6190d9e22d9ad33fba127431e4c3a107ce59b2 100644
--- a/chrome/browser/android/blimp/blimp_client_context_factory.cc
+++ b/chrome/browser/android/blimp/blimp_client_context_factory.cc
@@ -4,10 +4,16 @@
 
 #include "chrome/browser/android/blimp/blimp_client_context_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "base/supports_user_data.h"
 #include "blimp/client/public/blimp_client_context.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/signin/core/browser/profile_identity_provider.h"
+#include "components/signin/core/browser/signin_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -27,15 +33,30 @@ BlimpClientContextFactory::GetForBrowserContext(
 BlimpClientContextFactory::BlimpClientContextFactory()
     : BrowserContextKeyedServiceFactory(
           "blimp::client::BlimpClientContext",
-          BrowserContextDependencyManager::GetInstance()) {}
+          BrowserContextDependencyManager::GetInstance()) {
+}
 
 BlimpClientContextFactory::~BlimpClientContextFactory() {}
 
 KeyedService* BlimpClientContextFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
-  return blimp::client::BlimpClientContext::Create(
+  Profile* profile = static_cast<Profile*>(context);
+
+  KeyedService* blimp_context = blimp::client::BlimpClientContext::Create(
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO));
+
+  // Create OAuth2 token authenticator.
+  std::unique_ptr<IdentityProvider> identity_provider =
+      base::WrapUnique<IdentityProvider>(new ProfileIdentityProvider(
+          SigninManagerFactory::GetForProfile(profile),
+          ProfileOAuth2TokenServiceFactory::GetForProfile(profile),
+          base::Closure()));
+
+  static_cast<blimp::client::BlimpClientContext*>(blimp_context)
+      ->CreateAuthenticator(std::move(identity_provider));
+
+  return blimp_context;
 }
 
 content::BrowserContext* BlimpClientContextFactory::GetBrowserContextToUse(