Moved Google Update and install related code to cloud_print/common

cloud_print/common/win/cloud_print_utils.cc

 // Copyright 2013 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 "cloud_print/common/win/cloud_print_utils.h"
 
 #include <windows.h>
 
+#include "base/win/registry.h"
+
 namespace cloud_print {
 
+namespace {
+
+// Google Update related constants.
+const wchar_t kClientStateKey[] = L"SOFTWARE\\Google\\Update\\ClientState\\";
+const wchar_t* kUsageKey = L"dr";
+
+}  // namespace
+
 HRESULT GetLastHResult() {
   DWORD error_code = GetLastError();
   return error_code ? HRESULT_FROM_WIN32(error_code) : E_FAIL;
 }
 
 string16 LoadLocalString(DWORD id) {
   static wchar_t dummy = L'\0';
   HMODULE module = NULL;
   ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
                       GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, &dummy, &module);
   LPCWSTR buffer = NULL;
   // If the last parameter is 0, LoadString assume that 3rd parameter type is
   // LPCWSTR* and assign pointer to read-only memory with resource.
   int count = ::LoadString(module, id, reinterpret_cast<LPWSTR>(&buffer), 0);
   if (!buffer)
     return string16();
   return string16(buffer, buffer + count);
 }
 
 string16 GetErrorMessage(HRESULT hr) {
   LPWSTR buffer = NULL;
   ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |
                   FORMAT_MESSAGE_ALLOCATE_BUFFER,
                   0, hr, 0, reinterpret_cast<LPWSTR>(&buffer), 0, NULL);
   string16 result(buffer);
   ::LocalFree(buffer);
   return result;
 }
 
+void SetGoogleUpdateUsage(const string16& product_id) {
+  // Set appropriate key to 1 to let Omaha record usage.
+  base::win::RegKey key;
+  if (key.Create(HKEY_CURRENT_USER,
+                 (kClientStateKey + product_id).c_str(),
+                 KEY_SET_VALUE) != ERROR_SUCCESS ||
+      key.WriteValue(kUsageKey, L"1") != ERROR_SUCCESS) {
+    LOG(ERROR) << "Unable to set usage key";
+  }
+}
+
 }  // namespace cloud_print