Add Media device notification to SystemMonitor and Mac impl

base/system_monitor/system_monitor_unittest.cc

Index: base/system_monitor/system_monitor_unittest.cc
diff --git a/base/system_monitor/system_monitor_unittest.cc b/base/system_monitor/system_monitor_unittest.cc
index 1d5d6af86467c834b1f40172e0ef73c3e76262b3..69253439e7e341208729a6d839b2d2b41791db97 100644
--- a/base/system_monitor/system_monitor_unittest.cc
+++ b/base/system_monitor/system_monitor_unittest.cc
@@ -92,8 +92,7 @@ TEST(SystemMonitor, PowerNotifications) {
 
 class DevicesChangedTest : public SystemMonitor::DevicesChangedObserver {
  public:
-  DevicesChangedTest()
-      : changes_(0) {
+  DevicesChangedTest() : changes_(0), media_attaches_(0), media_detaches_(0) {
   }
 
   // DevicesChangedObserver callbacks.
@@ -101,11 +100,25 @@ class DevicesChangedTest : public SystemMonitor::DevicesChangedObserver {
     changes_++;
   }
 
+  virtual void OnMediaDeviceAttached(const SystemMonitor::DeviceIdType& id,
+                                     const std::string& name,
+                                     const FilePath& path) OVERRIDE {
+    media_attaches_++;
+  }
+  virtual void OnMediaDeviceDetached(
+      const SystemMonitor::DeviceIdType& name) OVERRIDE {
+    media_detaches_++;
+  }
+
   // Test status counts.
   int changes() const { return changes_; }
+  int media_attaches() const { return media_attaches_; }
+  int media_detaches() const { return media_detaches_; }
 
  private:
   int changes_;  // Count of OnDevicesChanged notifications.
+  int media_attaches_;  // Count of OnMediaDeviceAttached notifications.
+  int media_detaches_;  // Count of OnMediaDeviceDetached notifications.
 
   DISALLOW_COPY_AND_ASSIGN(DevicesChangedTest);
 };
@@ -128,11 +141,29 @@ TEST(SystemMonitor, DeviceChangeNotifications) {
   system_monitor.ProcessDevicesChanged();
   loop.RunAllPending();
   EXPECT_EQ(1, test[0].changes());
+  EXPECT_EQ(0, test[0].media_attaches());
+  EXPECT_EQ(0, test[0].media_detaches());
 
   system_monitor.ProcessDevicesChanged();
   system_monitor.ProcessDevicesChanged();
   loop.RunAllPending();
   EXPECT_EQ(3, test[0].changes());
+  EXPECT_EQ(0, test[0].media_attaches());
+  EXPECT_EQ(0, test[0].media_detaches());
+
+  system_monitor.ProcessMediaDeviceAttached(
+      1, "media device", FilePath(FILE_PATH_LITERAL("path")));
+  loop.RunAllPending();
+  EXPECT_EQ(3, test[0].changes());
+  EXPECT_EQ(1, test[0].media_attaches());
+  EXPECT_EQ(0, test[0].media_detaches());
+
+  system_monitor.ProcessMediaDeviceDetached(1);
+  system_monitor.ProcessMediaDeviceDetached(2);
+  loop.RunAllPending();
+  EXPECT_EQ(3, test[0].changes());
+  EXPECT_EQ(1, test[0].media_attaches());
+  EXPECT_EQ(2, test[0].media_detaches());
 }
 
 }  // namespace base