Declarative content scripts: Browser-side: per-extension shared memory regions (lazily loaded)

chrome/browser/extensions/shared_user_script_master.h

Index: chrome/browser/extensions/shared_user_script_master.h
diff --git a/chrome/browser/extensions/shared_user_script_master.h b/chrome/browser/extensions/shared_user_script_master.h
new file mode 100644
index 0000000000000000000000000000000000000000..7baed0df64d27e35f1a80a31a2c16c8b554c86d8
--- /dev/null
+++ b/chrome/browser/extensions/shared_user_script_master.h
@@ -0,0 +1,96 @@
+// 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 CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_
+#define CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_
+
+#include <set>
+
+#include "base/scoped_observer.h"
+#include "chrome/browser/extensions/user_script_master.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/browser/extension_registry_observer.h"
+#include "extensions/common/extension.h"
+
+namespace content {
+

[Devlin, 2014/07/31 20:32:24]

namespace content {
class BrowserContext;
}

+class BrowserContext;
+
+}  // namespace content
+
+class Profile;
+
+namespace extensions {
+
+class SharedUserScriptMaster : public UserScriptMaster,
+                               public ExtensionRegistryObserver {
+ public:
+  explicit SharedUserScriptMaster(Profile* profile);
+  virtual ~SharedUserScriptMaster();
+
+  // ExtensionRegistryObserver implementation.
+  virtual void OnExtensionLoaded(content::BrowserContext* browser_context,

[Devlin, 2014/07/31 20:32:24]

private

+                                 const Extension* extension) OVERRIDE;
+  virtual void OnExtensionUnloaded(
+      content::BrowserContext* browser_context,
+      const Extension* extension,
+      UnloadedExtensionInfo::Reason reason) OVERRIDE;
+
+  // UserScriptMaster implementation.
+  virtual void StartLoad() OVERRIDE;
+
+ protected:
+  // UserScriptMaster implementation.

[Devlin, 2014/07/31 20:32:24]

private

+  virtual void AcquireUserScripts(scoped_ptr<UserScriptList> scripts) OVERRIDE;
+  virtual ExtensionsInfo GetExtensionsInfo() OVERRIDE;
+  virtual std::set<ExtensionId> GetAddedExtensions() OVERRIDE;
+  virtual std::set<ExtensionId> GetAllManagedExtensions() OVERRIDE;
+  virtual std::set<ExtensionId> GetChangedExtensions() OVERRIDE;
+  virtual void ResetChangedExtensions() OVERRIDE;
+
+ private:
+  void OnExtensionSystemReady();

[Devlin, 2014/07/31 20:32:24]

comment

+
+  // Attempt to initiate a load of scripts. May need to signal a pending load if
+  // a load is already in progress.
+  void AttemptLoad();
+
+  bool is_loading() const {
+    // Ownership of |user_scripts_| is passed to the file thread when loading.
+    return user_scripts_.get() == NULL;
+  }
+
+  // List of scripts from currently-installed extensions we should load.
+  scoped_ptr<UserScriptList> user_scripts_;
+
+  // The IDs of the extensions which have changed since the last update sent to
+  // the renderer.
+  std::set<ExtensionId> changed_extensions_;
+
+  // The mutually-exclusive sets of extensions that were added or removed since
+  // the last script load.
+  std::set<ExtensionId> added_extensions_;
+  std::set<ExtensionId> removed_extensions_;
+
+  // Maps extension info needed for localization to an extension ID.
+  ExtensionsInfo extensions_info_;
+
+  // If the extensions service has finished loading its initial set of
+  // extensions.
+  bool extensions_service_ready_;
+
+  base::WeakPtrFactory<SharedUserScriptMaster> weak_factory_;
+
+  // Listen to extension load, unloaded notifications.
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedUserScriptMaster);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_