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

extensions/browser/updater/update_data_provider.cc

Index: extensions/browser/updater/update_data_provider.cc
diff --git a/extensions/browser/updater/update_data_provider.cc b/extensions/browser/updater/update_data_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5969b96f77b34b069ccdbe982dfd0ac45c8107d8
--- /dev/null
+++ b/extensions/browser/updater/update_data_provider.cc
@@ -0,0 +1,72 @@
+// Copyright 2015 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 "extensions/browser/updater/update_data_provider.h"
+
+#include "base/base64.h"
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/stl_util.h"
+#include "base/strings/string_util.h"
+#include "components/update_client/update_client.h"
+#include "content/public/browser/browser_thread.h"
+#include "crypto/sha2.h"
+#include "extensions/browser/content_verifier.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/updater/update_install_shim.h"
+#include "extensions/common/extension.h"
+
+namespace extensions {
+
+UpdateDataProvider::UpdateDataProvider(content::BrowserContext* context,
+                                       const InstallCallback& callback)
+    : context_(context), callback_(callback) {}
+
+UpdateDataProvider::~UpdateDataProvider() {}
+
+void UpdateDataProvider::Shutdown() {
+  context_ = nullptr;
+}
+
+void UpdateDataProvider::GetData(
+    const std::vector<std::string>& ids,
+    std::vector<update_client::CrxComponent>* data) {
+  if (!context_)
+    return;
+  ExtensionRegistry* registry = ExtensionRegistry::Get(context_);

[Sorin Jianu, 2015/10/02 00:05:10]

can this be const?

[asargent_no_longer_on_chrome, 2015/10/06 21:31:17]

Done.

+  for (const auto& id : ids) {
+    const Extension* extension = registry->GetInstalledExtension(id);
+    if (!extension)
+      continue;
+    data->push_back(update_client::CrxComponent());
+    update_client::CrxComponent* info = &data->back();

[Sorin Jianu, 2015/10/02 00:05:10]

is 44-45 an optimization to avoid a copy?

[asargent_no_longer_on_chrome, 2015/10/06 21:31:17]

Yes.

+    std::string pubkey_bytes;
+    base::Base64Decode(extension->public_key(), &pubkey_bytes);
+    info->pk_hash.resize(crypto::kSHA256Length, 0);
+    crypto::SHA256HashString(pubkey_bytes, vector_as_array(&info->pk_hash),
+                             info->pk_hash.size());
+    info->version = *extension->version();
+    info->allow_background_download = false;
+
+    info->installer = new UpdateInstallShim(
+        id, extension->path(),
+        base::Bind(&UpdateDataProvider::RunInstallCallback, this));
+  }
+}
+
+void UpdateDataProvider::RunInstallCallback(const std::string& extension_id,
+                                            const base::FilePath& temp_dir) {
+  if (!context_) {
+    content::BrowserThread::PostBlockingPoolTask(
+        FROM_HERE,
+        base::Bind(base::IgnoreResult(&base::DeleteFile), temp_dir, false));
+    return;
+  } else {
+    callback_.Run(context_, extension_id, temp_dir);
+  }
+}
+
+}  // namespace extensions