allow locking UI mode and block launching car dock for automotive

- add config to lock UI mode change: When this is enabled,
  request to change car mode will be ignored. Apps can check
  the config using UiModeManager.isUiModeLocked()
- add config to lock day / night mode: When this is enabled,
  apps cannot change day / night mode without having
  MODIFY_DAY_NIGHT_MODE permission.
  Apps can check the config using UiModeManager.isNightModeLocked()
- add config to disable car dock intent launch for home key
  and mode change
- All new configs have default values which keeps the current behavior.
  Car products should override the configs to get desirable behavior.

bug: 22700993
Change-Id: Ic0e58f3428151e0b1c19a2e9a7d6ded32ff962a6
diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index 9a7d153..2031061 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -158,8 +158,7 @@
     static final boolean SHOW_PROCESSES_ON_ALT_MENU = false;
 
     // Whether to allow dock apps with METADATA_DOCK_HOME to temporarily take over the Home key.
-    // No longer recommended for desk docks; still useful in car docks.
-    static final boolean ENABLE_CAR_DOCK_HOME_CAPTURE = true;
+    // No longer recommended for desk docks;
     static final boolean ENABLE_DESK_DOCK_HOME_CAPTURE = false;
 
     static final int SHORT_PRESS_POWER_NOTHING = 0;
@@ -316,6 +315,10 @@
     int[] mNavigationBarHeightForRotation = new int[4];
     int[] mNavigationBarWidthForRotation = new int[4];
 
+    // Whether to allow dock apps with METADATA_DOCK_HOME to temporarily take over the Home key.
+    // This is for car dock and this is updated from resource.
+    private boolean mEnableCarDockHomeCapture = true;
+
     boolean mBootMessageNeedsHiding;
     KeyguardServiceDelegate mKeyguardDelegate;
     final Runnable mWindowManagerDrawCallback = new Runnable() {
@@ -1398,6 +1401,8 @@
         mHomeIntent.addCategory(Intent.CATEGORY_HOME);
         mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                 | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
+        mEnableCarDockHomeCapture = context.getResources().getBoolean(
+                com.android.internal.R.bool.config_enableCarDockHomeLaunch);
         mCarDockIntent =  new Intent(Intent.ACTION_MAIN, null);
         mCarDockIntent.addCategory(Intent.CATEGORY_CAR_DOCK);
         mCarDockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
@@ -6404,7 +6409,7 @@
      * true:
      * <ul>
      *  <li>The device is not in either car mode or desk mode
-     *  <li>The device is in car mode but ENABLE_CAR_DOCK_HOME_CAPTURE is false
+     *  <li>The device is in car mode but mEnableCarDockHomeCapture is false
      *  <li>The device is in desk mode but ENABLE_DESK_DOCK_HOME_CAPTURE is false
      *  <li>The device is in car mode but there's no CAR_DOCK app with METADATA_DOCK_HOME
      *  <li>The device is in desk mode but there's no DESK_DOCK app with METADATA_DOCK_HOME
@@ -6418,7 +6423,7 @@
         // is, when in car mode you should be taken to car home regardless
         // of whether we are actually in a car dock.
         if (mUiMode == Configuration.UI_MODE_TYPE_CAR) {
-            if (ENABLE_CAR_DOCK_HOME_CAPTURE) {
+            if (mEnableCarDockHomeCapture) {
                 intent = mCarDockIntent;
             }
         } else if (mUiMode == Configuration.UI_MODE_TYPE_DESK) {
@@ -6938,6 +6943,7 @@
         pw.print(prefix); pw.print("mSupportAutoRotation="); pw.println(mSupportAutoRotation);
         pw.print(prefix); pw.print("mUiMode="); pw.print(mUiMode);
                 pw.print(" mDockMode="); pw.print(mDockMode);
+                pw.print(" mEnableCarDockHomeCapture="); pw.print(mEnableCarDockHomeCapture);
                 pw.print(" mCarDockRotation="); pw.print(mCarDockRotation);
                 pw.print(" mDeskDockRotation="); pw.println(mDeskDockRotation);
         pw.print(prefix); pw.print("mUserRotationMode="); pw.print(mUserRotationMode);