Add rudimentary UpdateService to app_shell

It can download a CRX from the web store using an ID given at the
command line.

This wires up utility process support for app_shell and establishes
a base for factoring additional extensions utility IPCs out of
//chrome in the near future.

BUG=398671
TBR=asargent@chromium.org for cloned dependency on omaha_query_params

Review URL: https://codereview.chromium.org/693233003

Cr-Commit-Position: refs/heads/master@{#303055}

4 files changed, 133 insertions, 0 deletions

diff --git a/extensions/utility/BUILD.gn b/extensions/utility/BUILD.gn
new file mode 100644
index 0000000..ad884a2
--- /dev/null
+++ b/extensions/utility/BUILD.gn
@@ -0,0 +1,26 @@
+# 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.
+
+import("//build/config/features.gni")
+
+assert(enable_extensions)
+
+# GYP version: extensions/extensions.gyp:extensions_utility
+source_set("utility") {
+  sources = [
+    "utility_handler.cc",
+    "utility_handler.h",
+  ]
+
+  deps = [
+    "//content/public/utility",
+    "//extensions/common",
+  ]
+
+  if (is_win) {
+    cflags = [
+      "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+    ]
+  }
+}
diff --git a/extensions/utility/DEPS b/extensions/utility/DEPS
new file mode 100644
index 0000000..8ad521e
--- /dev/null
+++ b/extensions/utility/DEPS
@@ -0,0 +1,3 @@
+include_rules = [
+  "+content/public/utility",
+]
diff --git a/extensions/utility/utility_handler.cc b/extensions/utility/utility_handler.cc
new file mode 100644
index 0000000..1298933
--- /dev/null
+++ b/extensions/utility/utility_handler.cc
@@ -0,0 +1,67 @@
+// 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 "extensions/utility/utility_handler.h"
+
+#include "base/command_line.h"
+#include "content/public/utility/utility_thread.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/extension_l10n_util.h"
+#include "extensions/common/extension_utility_messages.h"
+#include "extensions/common/update_manifest.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_message_macros.h"
+#include "ui/base/ui_base_switches.h"
+
+namespace extensions {
+
+namespace {
+
+bool Send(IPC::Message* message) {
+  return content::UtilityThread::Get()->Send(message);
+}
+
+void ReleaseProcessIfNeeded() {
+  content::UtilityThread::Get()->ReleaseProcessIfNeeded();
+}
+
+}  // namespace
+
+UtilityHandler::UtilityHandler() {
+}
+
+UtilityHandler::~UtilityHandler() {
+}
+
+// static
+void UtilityHandler::UtilityThreadStarted() {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  std::string lang = command_line->GetSwitchValueASCII(switches::kLang);
+  if (!lang.empty())
+    extension_l10n_util::SetProcessLocale(lang);
+}
+
+bool UtilityHandler::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(UtilityHandler, message)
+    IPC_MESSAGE_HANDLER(ExtensionUtilityMsg_ParseUpdateManifest,
+                        OnParseUpdateManifest)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void UtilityHandler::OnParseUpdateManifest(const std::string& xml) {
+  UpdateManifest manifest;
+  if (!manifest.Parse(xml)) {
+    Send(new ExtensionUtilityHostMsg_ParseUpdateManifest_Failed(
+        manifest.errors()));
+  } else {
+    Send(new ExtensionUtilityHostMsg_ParseUpdateManifest_Succeeded(
+        manifest.results()));
+  }
+  ReleaseProcessIfNeeded();
+}
+
+}  // namespace extensions
diff --git a/extensions/utility/utility_handler.h b/extensions/utility/utility_handler.h
new file mode 100644
index 0000000..0ae31ec
--- /dev/null
+++ b/extensions/utility/utility_handler.h
@@ -0,0 +1,37 @@
+// 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_UTILITY_UTILITY_HANDLER_
+#define EXTENSIONS_UTILITY_UTILITY_HANDLER_
+
+#include <string>
+
+#include "base/macros.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace extensions {
+
+// A handler for extensions-related IPC from within utility processes.
+class UtilityHandler {
+ public:
+  UtilityHandler();
+  ~UtilityHandler();
+
+  static void UtilityThreadStarted();
+
+  bool OnMessageReceived(const IPC::Message& message);
+
+ private:
+  // IPC message handlers.
+  void OnParseUpdateManifest(const std::string& xml);
+
+  DISALLOW_COPY_AND_ASSIGN(UtilityHandler);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_UTILITY_UTILITY_HANDLER_