Fix field trials not working in utility processes.

base/process/process_info_win.cc

Index: base/process/process_info_win.cc
diff --git a/base/process/process_info_win.cc b/base/process/process_info_win.cc
index 8c4b36cb19e7a39a18b5d86b46c85d64030ed75e..06780838fec2b36e3b81a00e77bb51cf0c68ce7c 100644
--- a/base/process/process_info_win.cc
+++ b/base/process/process_info_win.cc
@@ -13,6 +13,17 @@
 
 namespace base {
 
+namespace {
+
+HANDLE GetCurrentProcessToken() {
+  HANDLE process_token;
+  OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &process_token);
+  DCHECK(process_token != NULL && process_token != INVALID_HANDLE_VALUE);
+  return process_token;
+}
+
+}  // namespace
+
 // static
 const Time CurrentProcessInfo::CreationTime() {
   FILETIME creation_time = {};
@@ -27,16 +38,11 @@ const Time CurrentProcessInfo::CreationTime() {
 }
 
 IntegrityLevel GetCurrentProcessIntegrityLevel() {
-  HANDLE process_token;
-  if (!::OpenProcessToken(::GetCurrentProcess(),
-                          TOKEN_QUERY | TOKEN_QUERY_SOURCE, &process_token)) {
-    return INTEGRITY_UNKNOWN;
-  }
-  win::ScopedHandle scoped_process_token(process_token);
+  base::win::ScopedHandle scoped_process_token(GetCurrentProcessToken());
 
   DWORD token_info_length = 0;
-  if (::GetTokenInformation(process_token, TokenIntegrityLevel, nullptr, 0,
-                            &token_info_length) ||
+  if (::GetTokenInformation(scoped_process_token.Get(), TokenIntegrityLevel,
+                            nullptr, 0, &token_info_length) ||
       ::GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
     return INTEGRITY_UNKNOWN;
   }
@@ -44,8 +50,9 @@ IntegrityLevel GetCurrentProcessIntegrityLevel() {
   auto token_label_bytes = MakeUnique<char[]>(token_info_length);
   TOKEN_MANDATORY_LABEL* token_label =
       reinterpret_cast<TOKEN_MANDATORY_LABEL*>(token_label_bytes.get());
-  if (!::GetTokenInformation(process_token, TokenIntegrityLevel, token_label,
-                             token_info_length, &token_info_length)) {
+  if (!::GetTokenInformation(scoped_process_token.Get(), TokenIntegrityLevel,
+                             token_label, token_info_length,
+                             &token_info_length)) {
     return INTEGRITY_UNKNOWN;
   }
 
@@ -69,4 +76,19 @@ IntegrityLevel GetCurrentProcessIntegrityLevel() {
   return INTEGRITY_UNKNOWN;
 }
 
+bool IsCurrentProcessElevated() {
+  base::win::ScopedHandle scoped_process_token(GetCurrentProcessToken());
+
+  // Unlike TOKEN_ELEVATION_TYPE which returns TokenElevationTypeDefault when
+  // UAC is turned off, TOKEN_ELEVATION returns whether the process is elevated.
+  DWORD size;
+  TOKEN_ELEVATION elevation;
+  if (!GetTokenInformation(scoped_process_token.Get(), TokenElevation,
+                           &elevation, sizeof(elevation), &size)) {
+    PLOG(ERROR) << "GetTokenInformation() failed";
+    return false;
+  }
+  return !!elevation.TokenIsElevated;
+}
+
 }  // namespace base