chromeos: call GetIdleTime from power manager client

chrome/browser/chromeos/dbus/power_manager_client.h

Index: chrome/browser/chromeos/dbus/power_manager_client.h
diff --git a/chrome/browser/chromeos/dbus/power_manager_client.h b/chrome/browser/chromeos/dbus/power_manager_client.h
index 11ecf90dac6c65f750ebb0c7f35544c30a34a427..b613d520d4cc96e56c8c1b4ef6ffc46242bf5c7a 100644
--- a/chrome/browser/chromeos/dbus/power_manager_client.h
+++ b/chrome/browser/chromeos/dbus/power_manager_client.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_CHROMEOS_DBUS_POWER_MANAGER_CLIENT_H_
 #define CHROME_BROWSER_CHROMEOS_DBUS_POWER_MANAGER_CLIENT_H_
 
+#include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 
@@ -36,6 +38,10 @@ struct PowerSupplyStatus {
   const std::string& ToString() const;
 };
 
+// Callback used for processing the idle time.  The int64 param is the number of
+// milliseconds the user has been idle.
+typedef base::Callback<void(int64)> CalculateIdleTimeCallback;
+
 // PowerManagerClient is used to communicate with the power manager.
 class PowerManagerClient {
  public:
@@ -72,6 +78,11 @@ class PowerManagerClient {
   // Requests shutdown of the system.
   virtual void RequestShutdown() = 0;
 
+  // Calculates idle time asynchronously, after the idle time request has
+  // replied.  It passes the idle time in seconds to |callback|.  If it

[satorux1, 2011/11/15 02:07:12]

seconds -> milliseconds? The comment above says it's milliseconds.

[Simon Que, 2011/11/15 02:47:44]

Done. Actually the other way around.

+  // encounters some error, it passes -1 to |callback|.
+  virtual void CalculateIdleTime(const CalculateIdleTimeCallback& callback) = 0;
+
   // Creates the instance.
   static PowerManagerClient* Create(dbus::Bus* bus);