Add a more comprehensive background mode for a process.

base/process_util_unittest.cc

 // 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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
@@ skipping 242 matching lines @@
 }
 
 // Ensure that the priority of a process is restored correctly after
 // backgrounding and restoring.
 // Note: a platform may not be willing or able to lower the priority of
 // a process. The calls to SetProcessBackground should be noops then.
 TEST_F(ProcessUtilTest, SetProcessBackgrounded) {
   base::ProcessHandle handle = this->SpawnChild("SimpleChildProcess", false);
   base::Process process(handle);
   int old_priority = process.GetPriority();
-  process.SetProcessBackgrounded(true);
-  process.SetProcessBackgrounded(false);
+  if (process.SetProcessBackgrounded(true)) {
+    EXPECT_TRUE(process.IsProcessBackgrounded());
+    EXPECT_TRUE(process.SetProcessBackgrounded(false));
+    EXPECT_FALSE(process.IsProcessBackgrounded());
+  }
+  int new_priority = process.GetPriority();
+  EXPECT_EQ(old_priority, new_priority);
+}
+
+// Same as SetProcessBackgrounded but to this very process. It uses
+// a different code path at least for Windows.
+TEST_F(ProcessUtilTest, SetProcessBackgroundedSelf) {
+  base::Process process(base::Process::Current().handle());
+  int old_priority = process.GetPriority();
+  if (process.SetProcessBackgrounded(true)) {
+    EXPECT_TRUE(process.IsProcessBackgrounded());
+    EXPECT_TRUE(process.SetProcessBackgrounded(false));
+    EXPECT_FALSE(process.IsProcessBackgrounded());
+  }
   int new_priority = process.GetPriority();
   EXPECT_EQ(old_priority, new_priority);
 }
 
 // TODO(estade): if possible, port these 2 tests.
 #if defined(OS_WIN)
 TEST_F(ProcessUtilTest, EnableLFH) {
   ASSERT_TRUE(base::EnableLowFragmentationHeap());
   if (IsDebuggerPresent()) {
     // Under these conditions, LFH can't be enabled. There's no point to test
@@ skipping 646 matching lines @@
   ASSERT_DEATH({
       SetUpInDeathAssert();
       while ((value_ = base::AllocatePsychoticallyBigObjCObject())) {}
     }, "");
 }
 
 #endif  // !ARCH_CPU_64_BITS
 #endif  // OS_MACOSX
 
 #endif  // !defined(OS_WIN)