chromeos: call GetIdleTime from power manager client

chrome/browser/chromeos/dbus/power_manager_client.cc

Index: chrome/browser/chromeos/dbus/power_manager_client.cc
diff --git a/chrome/browser/chromeos/dbus/power_manager_client.cc b/chrome/browser/chromeos/dbus/power_manager_client.cc
index dc9761d64cc6623ba667637f98eaf099ba5efada..a429b2c07da802236fcc447a837f8afc183e9a45 100644
--- a/chrome/browser/chromeos/dbus/power_manager_client.cc
+++ b/chrome/browser/chromeos/dbus/power_manager_client.cc
@@ -153,6 +153,15 @@ class PowerManagerClientImpl : public PowerManagerClient {
         dbus::ObjectProxy::EmptyResponseCallback());
   }
 
+  virtual void CalculateIdleTime(CalculateIdleTimeCallback* callback) OVERRIDE {
+    dbus::MethodCall method_call(power_manager::kPowerManagerInterface,
+                                 power_manager::kGetIdleTime);
+    power_manager_proxy_->CallMethod(
+        &method_call,
+        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&PowerManagerClientImpl::OnGetIdleTime,
+                   weak_ptr_factory_.GetWeakPtr(), callback));
+  }
 
  private:
   // Called when a dbus signal is initially connected.
@@ -233,6 +242,25 @@ class PowerManagerClientImpl : public PowerManagerClient {
     FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(status));
   }
 
+  void OnGetIdleTime(CalculateIdleTimeCallback* callback,
+                     dbus::Response* response) {
+    DCHECK(callback);
+    dbus::MessageReader reader(response);
+    int64 idle_time_ms = 0;
+    if (!reader.PopInt64(&idle_time_ms)) {
+      LOG(ERROR) << "Error reading response from powerd: "
+                 << response->ToString();
+      return;
+    }
+    if (idle_time_ms >= 0) {
+      callback->Run(idle_time_ms/1000);
+    } else {
+      LOG(ERROR) << "Power manager failed to calculate idle time.";
+      callback->Run(-1);
+    }
+    delete callback;
+  }
+
   dbus::ObjectProxy* power_manager_proxy_;
   ObserverList<Observer> observers_;
   base::WeakPtrFactory<PowerManagerClientImpl> weak_ptr_factory_;
@@ -288,6 +316,9 @@ class PowerManagerClientStubImpl : public PowerManagerClient {
 
   virtual void RequestShutdown() OVERRIDE {}
 
+  virtual void CalculateIdleTime(CalculateIdleTimeCallback* callback) OVERRIDE {
+  }
+
  private:
   void Update() {
     // We pause at 0 and 100% so that it's easier to check those conditions.