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

chrome/browser/extensions/shared_user_script_master.cc

Index: chrome/browser/extensions/shared_user_script_master.cc
diff --git a/chrome/browser/extensions/shared_user_script_master.cc b/chrome/browser/extensions/shared_user_script_master.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7560ff3910b75065a50ef570359a5bbbbc8f409e
--- /dev/null
+++ b/chrome/browser/extensions/shared_user_script_master.cc
@@ -0,0 +1,140 @@
+// 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.
+
+#include "chrome/browser/extensions/shared_user_script_master.h"
+
+#include "base/bind.h"
+#include "base/memory/shared_memory.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/extensions/extension_util.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/extensions/api/i18n/default_locale_handler.h"
+#include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/render_process_host.h"
+#include "extensions/browser/content_verifier.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/common/one_shot_event.h"
+
+namespace extensions {
+
+SharedUserScriptMaster::SharedUserScriptMaster(Profile* profile)
+    : UserScriptMaster(profile, "" /* owner_extension_id */),
+      user_scripts_(new UserScriptList()),
+      weak_factory_(this),
+      extension_registry_observer_(this) {
+  extension_registry_observer_.Add(ExtensionRegistry::Get(this->profile()));
+  ExtensionSystem::Get(this->profile())->ready().Post(
+      FROM_HERE,
+      base::Bind(&SharedUserScriptMaster::OnExtensionSystemReady,
+                 weak_factory_.GetWeakPtr()));
+}
+
+SharedUserScriptMaster::~SharedUserScriptMaster() {
+}
+
+void SharedUserScriptMaster::OnExtensionLoaded(
+    content::BrowserContext* browser_context,
+    const Extension* extension) {
+  added_extensions_.insert(extension->id());
+  removed_extensions_.erase(extension->id());
+  extensions_info_[extension->id()] =
+      ExtensionSet::ExtensionPathAndDefaultLocale(
+          extension->path(), LocaleInfo::GetDefaultLocale(extension));
+  if (extensions_service_ready_)
+    changed_extensions_.insert(extension->id());
+}
+
+void SharedUserScriptMaster::OnExtensionUnloaded(
+    content::BrowserContext* browser_context,
+    const Extension* extension,
+    UnloadedExtensionInfo::Reason reason) {
+  removed_extensions_.insert(extension->id());
+  added_extensions_.erase(extension->id());
+  // Remove any content scripts.
+  extensions_info_.erase(extension->id());
+  changed_extensions_.insert(extension->id());
+  AttemptLoad();
+}
+
+void SharedUserScriptMaster::StartLoad() {
+  // Remove any user scripts belonging to any extension that was updated or
+  // removed.
+  for (UserScriptList::iterator iter = user_scripts_->begin();
+       iter != user_scripts_->end();) {
+    if (removed_extensions_.count(iter->extension_id()) > 0 ||
+        added_extensions_.count(iter->extension_id()) > 0) {
+      iter = user_scripts_->erase(iter);
+    } else {
+      ++iter;
+    }
+  }
+
+  // Add any content scripts for extensions that were recently loaded.
+  const ExtensionSet& enabled_extensions =
+      ExtensionRegistry::Get(profile())->enabled_extensions();
+  for (std::set<ExtensionId>::const_iterator iter = added_extensions_.begin();
+       iter != added_extensions_.end();
+       ++iter) {
+    const Extension* extension = enabled_extensions.GetByID(*iter);
+    if (!extension)
+      continue;
+    bool incognito_enabled =
+        util::IsIncognitoEnabled(extension->id(), profile());
+    const UserScriptList& scripts =
+        ContentScriptsInfo::GetContentScripts(extension);
+    for (UserScriptList::const_iterator script = scripts.begin();
+         script != scripts.end();
+         ++script) {
+      user_scripts_->push_back(*script);
+      user_scripts_->back().set_incognito_enabled(incognito_enabled);
+    }
+  }
+
+  LoadScripts(user_scripts_.Pass(), extensions_info_);
+
+  added_extensions_.clear();
+  removed_extensions_.clear();
+  user_scripts_.reset(NULL);
+}
+
+void SharedUserScriptMaster::AcquireUserScripts(
+    scoped_ptr<UserScriptList> scripts) {
+  user_scripts_.reset(scripts.release());
+}
+
+ExtensionsInfo SharedUserScriptMaster::GetExtensionsInfo() {
+  return extensions_info_;
+}
+
+std::set<ExtensionId> SharedUserScriptMaster::GetAddedExtensions() {
+  return added_extensions_;
+}
+
+std::set<ExtensionId> SharedUserScriptMaster::GetAllManagedExtensions() {
+  // Empty set = all extensions.
+  return std::set<ExtensionId>();
+}
+
+std::set<ExtensionId> SharedUserScriptMaster::GetChangedExtensions() {
+  return changed_extensions_;
+}
+
+void SharedUserScriptMaster::ResetChangedExtensions() {
+  changed_extensions_.clear();
+}
+
+void SharedUserScriptMaster::OnExtensionSystemReady() {
+  extensions_service_ready_ = true;
+  AttemptLoad();
+}
+
+void SharedUserScriptMaster::AttemptLoad() {
+  if (is_loading())
+    SignalPendingLoad();
+  else
+    StartLoad();
+}
+
+}  // namespace extensions