chromeos: Implement power button animations for Aura.

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 9b246a4d9205b13a094a199b5b2740ed69ac8798..94dd4512b12f31961c825c127ce9eabd740fb288 100644
--- a/chrome/browser/chromeos/dbus/power_manager_client.h
+++ b/chrome/browser/chromeos/dbus/power_manager_client.h
@@ -10,9 +10,12 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 
+namespace base {
+class TimeTicks;
+}
 namespace dbus {
 class Bus;
-}  // namespace
+}
 
 namespace chromeos {
 
@@ -57,6 +60,14 @@ class PowerManagerClient {
     // Called when the system resumes from suspend.
     virtual void SystemResumed() {}
 
+    // Called when the power button is pressed or released.
+    virtual void PowerButtonStateChanged(bool down,
+                                         const base::TimeTicks& timestamp) {}
+
+    // Called when the lock button is pressed or released.
+    virtual void LockButtonStateChanged(bool down,
+                                        const base::TimeTicks& timestamp) {}
+
     // Called when the screen is locked.
     virtual void LockScreen() {}