Update from https://crrev.com/327068

base/chromeos/memory_pressure_monitor_chromeos_unittest.cc

 // Copyright 2014 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 "base/basictypes.h"
-#include "base/chromeos/memory_pressure_observer_chromeos.h"
+#include "base/chromeos/memory_pressure_monitor_chromeos.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 // True if the memory notifier got called.
 // Do not read/modify value directly.
@@ skipping 16 matching lines @@
 
 // Returns true when OnMemoryPressure was called (and resets it).
 bool WasOnMemoryPressureCalled() {
   bool b = on_memory_pressure_called;
   ResetOnMemoryPressureCalled();
   return b;
 }
 
 }  // namespace
 
-class TestMemoryPressureObserver : public MemoryPressureObserverChromeOS {
+class TestMemoryPressureMonitor : public MemoryPressureMonitorChromeOS {
  public:
-  TestMemoryPressureObserver() :
-    MemoryPressureObserverChromeOS(
-        MemoryPressureObserverChromeOS::THRESHOLD_DEFAULT),
+  TestMemoryPressureMonitor() :
+    MemoryPressureMonitorChromeOS(
+        MemoryPressureMonitorChromeOS::THRESHOLD_DEFAULT),
     memory_in_percent_override_(0) {
     // Disable any timers which are going on and set a special memory reporting
     // function.
     StopObserving();
   }
-  ~TestMemoryPressureObserver() override {}
+  ~TestMemoryPressureMonitor() override {}
 
   void SetMemoryInPercentOverride(int percent) {
     memory_in_percent_override_ = percent;
   }
 
   void CheckMemoryPressureForTest() {
     CheckMemoryPressure();
   }
 
  private:
   int GetUsedMemoryInPercent() override {
     return memory_in_percent_override_;
   }
 
   int memory_in_percent_override_;
-  DISALLOW_COPY_AND_ASSIGN(TestMemoryPressureObserver);
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryPressureMonitor);
 };
 
 // This test tests the various transition states from memory pressure, looking
 // for the correct behavior on event reposting as well as state updates.
-TEST(MemoryPressureObserverChromeOSTest, CheckMemoryPressure) {
+TEST(MemoryPressureMonitorChromeOSTest, CheckMemoryPressure) {
   base::MessageLoopForUI message_loop;
-  scoped_ptr<TestMemoryPressureObserver> observer(
-      new TestMemoryPressureObserver);
+  scoped_ptr<TestMemoryPressureMonitor> monitor(
+      new TestMemoryPressureMonitor);
   scoped_ptr<MemoryPressureListener> listener(
       new MemoryPressureListener(base::Bind(&OnMemoryPressure)));
   // Checking the memory pressure while 0% are used should not produce any
   // events.
-  observer->SetMemoryInPercentOverride(0);
+  monitor->SetMemoryInPercentOverride(0);
   ResetOnMemoryPressureCalled();
 
-  observer->CheckMemoryPressureForTest();
+  monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_FALSE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
-            observer->GetCurrentPressureLevel());
+            monitor->GetCurrentPressureLevel());
 
   // Setting the memory level to 80% should produce a moderate pressure level.
-  observer->SetMemoryInPercentOverride(80);
-  observer->CheckMemoryPressureForTest();
+  monitor->SetMemoryInPercentOverride(80);
+  monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_TRUE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-            observer->GetCurrentPressureLevel());
+            monitor->GetCurrentPressureLevel());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
             on_memory_pressure_level);
 
   // We need to check that the event gets reposted after a while.
   int i = 0;
   for (; i < 100; i++) {
-    observer->CheckMemoryPressureForTest();
+    monitor->CheckMemoryPressureForTest();
     message_loop.RunUntilIdle();
     EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-              observer->GetCurrentPressureLevel());
+              monitor->GetCurrentPressureLevel());
     if (WasOnMemoryPressureCalled()) {
       EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
                 on_memory_pressure_level);
       break;
     }
   }
   // Should be more then 5 and less then 100.
   EXPECT_LE(5, i);
   EXPECT_GE(99, i);
 
   // Setting the memory usage to 99% should produce critical levels.
-  observer->SetMemoryInPercentOverride(99);
-  observer->CheckMemoryPressureForTest();
+  monitor->SetMemoryInPercentOverride(99);
+  monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_TRUE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
             on_memory_pressure_level);
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            observer->GetCurrentPressureLevel());
+            monitor->GetCurrentPressureLevel());
 
   // Calling it again should immediately produce a second call.
-  observer->CheckMemoryPressureForTest();
+  monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_TRUE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
             on_memory_pressure_level);
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            observer->GetCurrentPressureLevel());
+            monitor->GetCurrentPressureLevel());
 
   // When lowering the pressure again we should not get an event, but the
   // pressure should go back to moderate.
-  observer->SetMemoryInPercentOverride(80);
-  observer->CheckMemoryPressureForTest();
+  monitor->SetMemoryInPercentOverride(80);
+  monitor->CheckMemoryPressureForTest();
   message_loop.RunUntilIdle();
   EXPECT_FALSE(WasOnMemoryPressureCalled());
   EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-            observer->GetCurrentPressureLevel());
+            monitor->GetCurrentPressureLevel());
 
   // We should need exactly the same amount of calls as before, before the next
   // call comes in.
   int j = 0;
   for (; j < 100; j++) {
-    observer->CheckMemoryPressureForTest();
+    monitor->CheckMemoryPressureForTest();
     message_loop.RunUntilIdle();
     EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-              observer->GetCurrentPressureLevel());
+              monitor->GetCurrentPressureLevel());
     if (WasOnMemoryPressureCalled()) {
       EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
                 on_memory_pressure_level);
       break;
     }
   }
   // We should have needed exactly the same amount of checks as before.
   EXPECT_EQ(j, i);
 }
 
 }  // namespace base