Move most of the component updater artifacts to update_client.

components/update_client/update_client.h

Index: components/update_client/update_client.h
diff --git a/components/update_client/update_client.h b/components/update_client/update_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..07b5617a8d7c9acbb5266abb67df9ba5953342a9
--- /dev/null
+++ b/components/update_client/update_client.h
@@ -0,0 +1,71 @@
+// 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.
+
+#ifndef COMPONENTS_UPDATE_CLIENT_UPDATE_CLIENT_H_
+#define COMPONENTS_UPDATE_CLIENT_UPDATE_CLIENT_H_
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+#include "base/version.h"
+
+namespace base {
+class DictionaryValue;
+class FilePath;
+}
+
+namespace update_client {
+
+// Component specific installers must derive from this class and implement
+// OnUpdateError() and Install(). A valid instance of this class must be
+// given to ComponentUpdateService::RegisterComponent().
+class ComponentInstaller {
+ public:
+  // Called by the component updater on the main thread when there was a
+  // problem unpacking or verifying the component. |error| is a non-zero
+  // value which is only meaningful to the component updater.
+  virtual void OnUpdateError(int error) = 0;
+
+  // Called by the component updater when a component has been unpacked
+  // and is ready to be installed. |manifest| contains the CRX manifest
+  // json dictionary and |unpack_path| contains the temporary directory
+  // with all the unpacked CRX files. This method may be called from
+  // a thread other than the main thread.
+  virtual bool Install(const base::DictionaryValue& manifest,
+                       const base::FilePath& unpack_path) = 0;
+
+  // Set |installed_file| to the full path to the installed |file|. |file| is
+  // the filename of the file in this component's CRX. Returns false if this is
+  // not possible (the file has been removed or modified, or its current
+  // location is unknown). Otherwise, returns true.
+  virtual bool GetInstalledFile(const std::string& file,
+                                base::FilePath* installed_file) = 0;
+
+  virtual ~ComponentInstaller() {}
+};
+
+// Describes a particular component that can be installed or updated. This
+// structure is required to register a component with the component updater.
+// |pk_hash| is the SHA256 hash of the component's public key. If the component
+// is to be installed then version should be "0" or "0.0", else it should be
+// the current version. |fingerprint|, and |name| are optional.
+// |allow_background_download| specifies that the component can be background
+// downloaded in some cases. The default for this value is |true| and the value
+// can be overriden at the registration time. This is a temporary change until
+// the issue 340448 is resolved.
+struct CrxComponent {
+  std::vector<uint8_t> pk_hash;
+  ComponentInstaller* installer;
+  Version version;
+  std::string fingerprint;
+  std::string name;
+  bool allow_background_download;
+  CrxComponent();
+  ~CrxComponent();
+};
+
+}  // namespace update_client
+
+#endif  // COMPONENTS_UPDATE_CLIENT_UPDATE_CLIENT_H_