Extract a MockExtensionSystem to be used with TestExtensionsBrowserClient.

extensions/browser/mock_extension_system.h

Index: extensions/browser/mock_extension_system.h
diff --git a/extensions/browser/mock_extension_system.h b/extensions/browser/mock_extension_system.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_
+#define EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_
+
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "extensions/browser/extension_registry_factory.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_system_provider.h"
+#include "extensions/common/one_shot_event.h"
+
+namespace extensions {
+
+// An empty ExtensionSystem for testing. Tests that need only specific
+// parts of ExtensionSystem should derive from this class and override
+// functions as needed. To use this, use
+// TestExtensionsBrowserClient::set_extension_system_factory
+// with the MockExtensionSystemFactory below.
+class MockExtensionSystem : public ExtensionSystem {
+ public:
+  explicit MockExtensionSystem(content::BrowserContext* context);
+  virtual ~MockExtensionSystem();
+
+  content::BrowserContext* browser_context() { return browser_context_; }
+
+  // ExtensionSystem overrides:
+  virtual void InitForRegularProfile(bool extensions_enabled) OVERRIDE;
+  virtual ExtensionService* extension_service() OVERRIDE;
+  virtual RuntimeData* runtime_data() OVERRIDE;
+  virtual ManagementPolicy* management_policy() OVERRIDE;
+  virtual UserScriptMaster* user_script_master() OVERRIDE;
+  virtual ProcessManager* process_manager() OVERRIDE;
+  virtual StateStore* state_store() OVERRIDE;
+  virtual StateStore* rules_store() OVERRIDE;
+  virtual InfoMap* info_map() OVERRIDE;
+  virtual LazyBackgroundTaskQueue* lazy_background_task_queue() OVERRIDE;
+  virtual EventRouter* event_router() OVERRIDE;
+  virtual ExtensionWarningService* warning_service() OVERRIDE;
+  virtual Blacklist* blacklist() OVERRIDE;
+  virtual ErrorConsole* error_console() OVERRIDE;
+  virtual InstallVerifier* install_verifier() OVERRIDE;
+  virtual QuotaService* quota_service() OVERRIDE;
+  virtual const OneShotEvent& ready() const OVERRIDE;
+  virtual ContentVerifier* content_verifier() OVERRIDE;
+  virtual scoped_ptr<ExtensionSet> GetDependentExtensions(
+      const Extension* extension) OVERRIDE;
+
+ private:
+  content::BrowserContext* browser_context_;
+  OneShotEvent ready_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockExtensionSystem);
+};
+
+// A factory to create a MockExtensionSystem. Sample use:
+//
+// MockExtensionSystemFactory<MockExtensionSystemSubclass> factory;
+// TestExtensionsBrowserClient::set_extension_system_factory(factory);
+template <typename T>
+class MockExtensionSystemFactory : public ExtensionSystemProvider {
+ public:
+  MockExtensionSystemFactory()
+      : ExtensionSystemProvider(
+            "MockExtensionSystem",
+            BrowserContextDependencyManager::GetInstance()) {
+    DependsOn(ExtensionRegistryFactory::GetInstance());
+  }
+
+  virtual ~MockExtensionSystemFactory() {}
+
+  // BrowserContextKeyedServiceFactory overrides:
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const OVERRIDE {
+    return new T(context);
+  }
+
+  // ExtensionSystemProvider overrides:
+  virtual ExtensionSystem* GetForBrowserContext(
+      content::BrowserContext* context) OVERRIDE {
+    return static_cast<ExtensionSystem*>(
+        GetServiceForBrowserContext(context, true));
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockExtensionSystemFactory);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_MOCK_EXTENSIONS_SYSTEM_H_