Fix up crash reporting in unit tests and the Chrome Frame helper processes:

chrome_frame/crash_server_init.cc

Index: chrome_frame/crash_server_init.cc
===================================================================
--- chrome_frame/crash_server_init.cc	(revision 89645)
+++ chrome_frame/crash_server_init.cc	(working copy)
@@ -1,22 +1,75 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_frame/crash_server_init.h"
 
+#include <sddl.h>
+#include <Shlobj.h>
+#include <stdlib.h>
 #include "version.h"  // NOLINT
 
 const wchar_t kChromePipeName[] = L"\\\\.\\pipe\\ChromeCrashServices";
 const wchar_t kGoogleUpdatePipeName[] = L"\\\\.\\pipe\\GoogleCrashServices\\";
 const wchar_t kSystemPrincipalSid[] = L"S-1-5-18";
 
-const wchar_t kFullMemoryCrashReport[] = L"full-memory-crash-report";
-
 const MINIDUMP_TYPE kLargerDumpType = static_cast<MINIDUMP_TYPE>(
     MiniDumpWithProcessThreadData |  // Get PEB and TEB.
     MiniDumpWithUnloadedModules |  // Get unloaded modules when available.
     MiniDumpWithIndirectlyReferencedMemory);  // Get memory referenced by stack.
 
+extern "C" IMAGE_DOS_HEADER __ImageBase;
+
+// Builds a string representation of the user's SID and places it in user_sid.
+bool GetUserSidString(std::wstring* user_sid) {
+  bool success = false;
+  if (user_sid) {
+    struct {
+      TOKEN_USER token_user;
+      BYTE buffer[SECURITY_MAX_SID_SIZE];
+    } token_info_buffer;
+
+    HANDLE token = NULL;
+    if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)) {
+      DWORD out_size;
+      if (GetTokenInformation(token, TokenUser, &token_info_buffer.token_user,
+                              sizeof(token_info_buffer), &out_size)) {
+        wchar_t* user_sid_value = NULL;
+        if (token_info_buffer.token_user.User.Sid &&
+            ConvertSidToStringSid(token_info_buffer.token_user.User.Sid,
+                                  &user_sid_value)) {
+          *user_sid = user_sid_value;
+          LocalFree(user_sid_value);
+          user_sid_value = NULL;
+          success = true;
+        }
+      }
+      CloseHandle(token);
+    }
+  }
+
+  return success;
+}
+
+bool IsRunningSystemInstall() {
+  wchar_t exe_path[MAX_PATH * 2] = {0};
+  GetModuleFileName(reinterpret_cast<HMODULE>(&__ImageBase),
+                    exe_path,
+                    _countof(exe_path));
+
+  bool is_system = false;
+
+  wchar_t program_files_path[MAX_PATH] = {0};
+  if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PROGRAM_FILES, NULL,
+                                SHGFP_TYPE_CURRENT, program_files_path))) {
+    if (wcsstr(exe_path, program_files_path) == exe_path) {
+      is_system = true;
+    }
+  }
+
+  return is_system;
+}
+
 google_breakpad::CustomClientInfo* GetCustomInfo() {
   static google_breakpad::CustomInfoEntry ver_entry(
       L"ver", TEXT(CHROME_VERSION_STRING));
@@ -31,22 +84,31 @@
 }
 
 google_breakpad::ExceptionHandler* InitializeCrashReporting(
-    const wchar_t* cmd_line) {
-  if (cmd_line == NULL) {
-    return NULL;
-  }
-
+    CrashReportingMode mode) {
   wchar_t temp_path[MAX_PATH + 1] = {0};
   DWORD path_len = ::GetTempPath(MAX_PATH, temp_path);
 
   std::wstring pipe_name;
-  if (wcsstr(cmd_line, kFullMemoryCrashReport) != NULL) {
+  if (mode == HEADLESS) {
+    // This flag is used for testing, connect to the test crash service.
     pipe_name = kChromePipeName;
   } else {
-    // TODO(robertshield): Figure out if we're a per-user install and connect
-    // to the per-user named pipe instead.
+    // Otherwise, build a pipe name corresponding to either user or
+    // system-level Omaha.
     pipe_name = kGoogleUpdatePipeName;
-    pipe_name += kSystemPrincipalSid;
+    if (IsRunningSystemInstall()) {
+      pipe_name += kSystemPrincipalSid;
+    } else {
+      std::wstring user_sid;
+      if (GetUserSidString(&user_sid)) {
+        pipe_name += user_sid;
+      } else {
+        // We don't think we're a system install, but we couldn't get the
+        // user SID. Try connecting to the system-level crash service as a
+        // last ditch effort.
+        pipe_name += kSystemPrincipalSid;
+      }
+    }
   }
 
   google_breakpad::ExceptionHandler* breakpad =