Added memory-monitor for ChromeOS.

content/browser/memory/memory_monitor_chromeos_unittest.cc

+// Copyright (c) 2016 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 "content/browser/memory/memory_monitor_chromeos.h"
+
+#include "content/browser/memory/test_memory_monitor.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+// A delegate that allows mocking the various inputs to MemoryMonitorChromeOS.
+class TestMemoryMonitorChromeOSDelegate : public TestMemoryMonitorDelegate {
+ public:
+  TestMemoryMonitorChromeOSDelegate() {}
+
+  void SetFreeMemoryKB(int free_kb,
+                       int swap_kb,
+                       int active_kb,
+                       int inactive_kb,
+                       int dirty_kb) {
+    mem_info_.free = free_kb;
+    mem_info_.swap_free = swap_kb;
+    mem_info_.active_file = active_kb;
+    mem_info_.inactive_file = inactive_kb;
+    mem_info_.dirty = dirty_kb;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryMonitorChromeOSDelegate);
+};
+
+class TestMemoryMonitorChromeOS : public MemoryMonitorChromeOS {};
+
+static const int kKBperMB = 1024;
+
+}  // namespace
+
+class MemoryMonitorChromeOSTest : public testing::Test {
+ public:
+  TestMemoryMonitorChromeOSDelegate delegate_;
+  std::unique_ptr<MemoryMonitorChromeOS> monitor_;
+};
+
+TEST_F(MemoryMonitorChromeOSTest, Create) {
+  delegate_.SetTotalMemoryKB(100000 * kKBperMB);
+  monitor_ = MemoryMonitorChromeOS::Create(&delegate_);
+  EXPECT_EQ(0U, delegate_.calls());
+}
+
+TEST_F(MemoryMonitorChromeOSTest, GetFreeMemoryUntilCriticalMB) {
+  delegate_.SetTotalMemoryKB(1000 * kKBperMB);
+
+  monitor_.reset(new MemoryMonitorChromeOS(&delegate_));
+  EXPECT_EQ(0u, delegate_.calls());
+
+  delegate_.SetFreeMemoryKB(256 * kKBperMB, 128 * kKBperMB, 64 * kKBperMB,
+                            32 * kKBperMB, 16 * kKBperMB);
+  EXPECT_EQ(318, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(1U, delegate_.calls());
+}
+
+}  // namespace content