DO NOT MERGE Notify keyguard of when power button is pressed.

This is done on wear power button doesn't turn off the screen,
when the device wakes from keyguard UI isn't visible yet, so
it needs to react to power press in some way.

Bug: 35147955
Change-Id: I22619ea446770d09b53370e9244215646b60a9db

core/java/com/android/internal/policy/IKeyguardService.aidl

@@ -98,4 +98,10 @@ oneway interface IKeyguardService {
      * to start the keyguard dismiss sequence.
      */
     void onActivityDrawn();
+
+    /**
+     * Notifies the Keyguard that the power key was pressed while locked and launched Home rather
+     * than putting the device to sleep or waking up.
+     */
+    void onShortPowerPressedGoHome();
 }

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardService.java

@@ -202,6 +202,12 @@ public class KeyguardService extends Service {
             checkPermission();
             mKeyguardViewMediator.onActivityDrawn();
         }
+
+        @Override
+        public void onShortPowerPressedGoHome() {
+            checkPermission();
+            mKeyguardViewMediator.onShortPowerPressedGoHome();
+        }
     };
 }
 

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -1943,6 +1943,10 @@ public class KeyguardViewMediator extends SystemUI {
         mHandler.sendEmptyMessage(ON_ACTIVITY_DRAWN);
     }
 
+    public void onShortPowerPressedGoHome() {
+        // do nothing
+    }
+
     public ViewMediatorCallback getViewMediatorCallback() {
         return mViewMediatorCallback;
     }

services/core/java/com/android/server/policy/PhoneWindowManager.java

@@ -1301,20 +1301,28 @@ public class PhoneWindowManager implements WindowManagerPolicy {
                     launchHomeFromHotKey();
                     break;
                 case SHORT_PRESS_POWER_GO_HOME:
-                    launchHomeFromHotKey(true /* awakenFromDreams */, false /*respectKeyguard*/);
+                    shortPressPowerGoHome();
                     break;
                 case SHORT_PRESS_POWER_CLOSE_IME_OR_GO_HOME:
                     if (mWindowManagerFuncs.isInputMethodWindowVisible()) {
                         mWindowManagerFuncs.hideCurrentInputMethod();
                     } else {
-                        launchHomeFromHotKey(true /* awakenFromDreams */,
-                            false /*respectKeyguard*/);
+                        shortPressPowerGoHome();
                     }
                     break;
             }
         }
     }
 
+    private void shortPressPowerGoHome() {
+        launchHomeFromHotKey(true /* awakenFromDreams */, false /*respectKeyguard*/);
+        if (isKeyguardShowingAndNotOccluded()) {
+            // Notify keyguard so it can do any special handling for the power button since the
+            // device will not power off and only launch home.
+            mKeyguardDelegate.onShortPowerPressedGoHome();
+        }
+    }
+
     private void powerMultiPressAction(long eventTime, boolean interactive, int behavior) {
         switch (behavior) {
             case MULTI_PRESS_POWER_NOTHING:

services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java

@@ -427,6 +427,12 @@ public class KeyguardServiceDelegate {
         }
     }
 
+    public void onShortPowerPressedGoHome() {
+        if (mKeyguardService != null) {
+            mKeyguardService.onShortPowerPressedGoHome();
+        }
+    }
+
     public void dump(String prefix, PrintWriter pw) {
         pw.println(prefix + TAG);
         prefix += "  ";

services/core/java/com/android/server/policy/keyguard/KeyguardServiceWrapper.java

@@ -228,6 +228,15 @@ public class KeyguardServiceWrapper implements IKeyguardService {
         }
     }
 
+    @Override
+    public void onShortPowerPressedGoHome() {
+        try {
+            mService.onShortPowerPressedGoHome();
+        } catch (RemoteException e) {
+            Slog.w(TAG , "Remote Exception", e);
+        }
+    }
+
     @Override // Binder interface
     public IBinder asBinder() {
         return mService.asBinder();