Android: Integrates native and java SystemMonitor.

base/system_monitor/system_monitor_android.cc

 // Copyright (c) 2011 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/system_monitor/system_monitor.h"
+#include "jni/SystemMonitor_jni.h"
 
 namespace base {
+namespace android {
+
+void OnBatteryChargingChanged(JNIEnv* env,

[vandebo (ex-Chrome), 2012/10/04 17:55:56]

This is nativeOnBatteryChargingChanged?  A comment to that effect wouldn't hurt.
 Took me a bit to figure that out.

[bulach, 2012/10/04 18:33:33]

done, sorry about all the magic going in here.
I can explain in lengthy details if you want, but a super high level overview:
we parse the java side and auto-generate bindings / stubs (above,
jni/SystemMonitor_jni.h).. 

these methods will then be bound to the native side via the registration
function mentioned above.

+                              jclass clazz,
+                              jboolean is_charging) {
+  SystemMonitor::Get()->SetBatteryIsCharging(is_charging);
+}
+
+}  // namespace android
 
 bool SystemMonitor::IsBatteryPower() {
-  NOTIMPLEMENTED();
-  return true;
+  return is_battery_charging_;
+}
+
+void SystemMonitor::SetBatteryIsCharging(bool is_battery_charging) {
+  is_battery_charging_ = is_battery_charging;
+  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
+}
+
+bool SystemMonitor::RegisterSystemMonitor(JNIEnv* env) {
+  return base::android::RegisterNativesImpl(env);
 }
 
 }  // namespace base