Add extensions code to use common updater in components/update_client/

extensions/browser/test_extensions_browser_client.h

Index: extensions/browser/test_extensions_browser_client.h
diff --git a/extensions/browser/test_extensions_browser_client.h b/extensions/browser/test_extensions_browser_client.h
index 274a8a98157310eb5e589db79e0b11340b4d1790..be660e7e6d80f813525c33b01ef491ba1b1fda25 100644
--- a/extensions/browser/test_extensions_browser_client.h
+++ b/extensions/browser/test_extensions_browser_client.h
@@ -5,7 +5,13 @@
 #ifndef EXTENSIONS_BROWSER_TEST_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_TEST_EXTENSIONS_BROWSER_CLIENT_H_
 
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "components/update_client/update_client.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/updater/extension_cache.h"
 
@@ -30,6 +36,10 @@ class TestExtensionsBrowserClient : public ExtensionsBrowserClient {
     extension_cache_ = extension_cache.Pass();
   }
 
+  // Sets a factory to respond to calls of the CreateUpdateClient method.
+  void SetUpdateClientFactory(
+      const base::Callback<update_client::UpdateClient*(void)>& factory);
+
   // Associates an incognito context with |main_context_|.
   void SetIncognitoContext(content::BrowserContext* incognito_context);
 
@@ -97,6 +107,8 @@ class TestExtensionsBrowserClient : public ExtensionsBrowserClient {
   bool IsMinBrowserVersionSupported(const std::string& min_version) override;
   ExtensionWebContentsObserver* GetExtensionWebContentsObserver(
       content::WebContents* web_contents) override;
+  scoped_refptr<update_client::UpdateClient> CreateUpdateClient(
+      content::BrowserContext* context) override;
 
  private:
   content::BrowserContext* main_context_;       // Not owned.
@@ -110,6 +122,8 @@ class TestExtensionsBrowserClient : public ExtensionsBrowserClient {
 
   scoped_ptr<ExtensionCache> extension_cache_;
 
+  base::Callback<update_client::UpdateClient*(void)> update_client_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(TestExtensionsBrowserClient);
 };