Make base::PowerMonitor work on Chrome OS.

chromeos/dbus/power_manager_client.cc

Index: chromeos/dbus/power_manager_client.cc
diff --git a/chromeos/dbus/power_manager_client.cc b/chromeos/dbus/power_manager_client.cc
index c094d9d2801da1a31658b47392158f1f21a82019..d2a38171aaf111e20e9261e7f1492434ee6ef5e1 100644
--- a/chromeos/dbus/power_manager_client.cc
+++ b/chromeos/dbus/power_manager_client.cc
@@ -14,6 +14,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list.h"
+#include "base/power_monitor/power_monitor_device_source.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
@@ -403,7 +404,7 @@ class PowerManagerClientImpl : public PowerManagerClient {
     dbus::MessageReader reader(signal);
     power_manager::PowerSupplyProperties protobuf;
     if (reader.PopArrayOfBytesAsProto(&protobuf)) {
-      FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(protobuf));
+      HandlePowerSupplyProperties(protobuf);
     } else {
       LOG(ERROR) << "Unable to decode "
                  << power_manager::kPowerSupplyPollSignal << "signal";
@@ -420,7 +421,7 @@ class PowerManagerClientImpl : public PowerManagerClient {
     dbus::MessageReader reader(response);
     power_manager::PowerSupplyProperties protobuf;
     if (reader.PopArrayOfBytesAsProto(&protobuf)) {
-      FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(protobuf));
+      HandlePowerSupplyProperties(protobuf);
     } else {
       LOG(ERROR) << "Unable to decode "
                  << power_manager::kGetPowerSupplyPropertiesMethod
@@ -444,6 +445,14 @@ class PowerManagerClientImpl : public PowerManagerClient {
     callback.Run(percent);
   }
 
+  void HandlePowerSupplyProperties(
+      const power_manager::PowerSupplyProperties& proto) {
+    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(proto));
+    const bool on_battery = proto.external_power() ==
+        power_manager::PowerSupplyProperties_ExternalPower_DISCONNECTED;
+    base::PowerMonitorDeviceSource::SetPowerSource(on_battery);
+  }
+
   void HandleRegisterSuspendDelayReply(bool dark_suspend,
                                        const std::string& method_name,
                                        dbus::Response* response) {
@@ -507,6 +516,7 @@ class PowerManagerClientImpl : public PowerManagerClient {
       FOR_EACH_OBSERVER(Observer, observers_, DarkSuspendImminent());
     else
       FOR_EACH_OBSERVER(Observer, observers_, SuspendImminent());
+    base::PowerMonitorDeviceSource::HandleSystemSuspending();
     MaybeReportSuspendReadiness();
   }
 
@@ -526,6 +536,7 @@ class PowerManagerClientImpl : public PowerManagerClient {
             << " duration=" << duration.InSeconds() << " sec";
     FOR_EACH_OBSERVER(
         PowerManagerClient::Observer, observers_, SuspendDone(duration));
+    base::PowerMonitorDeviceSource::HandleSystemResumed();
   }
 
   void IdleActionImminentReceived(dbus::Signal* signal) {