Use invisible icon for POINTER_ICON_STYLE_NULL.

Change-Id: I10d35bdc4da4817d769eb164e6f15e4618670a05
diff --git a/libs/input/PointerController.cpp b/libs/input/PointerController.cpp
index 0f86bc6..4a1d7e7 100644
--- a/libs/input/PointerController.cpp
+++ b/libs/input/PointerController.cpp
@@ -78,7 +78,7 @@
     mLocked.pointerAlpha = 0.0f; // pointer is initially faded
     mLocked.pointerSprite = mSpriteController->createSprite();
     mLocked.pointerIconChanged = false;
-    mLocked.requestedPointerShape = 0;
+    mLocked.requestedPointerShape = mPolicy->getDefaultPointerIconId();
 
     mLocked.buttonState = 0;
 
@@ -512,7 +512,7 @@
 
     if (mLocked.pointerIconChanged || mLocked.presentationChanged) {
         if (mLocked.presentation == PRESENTATION_POINTER) {
-            if (mLocked.requestedPointerShape == 0) {
+            if (mLocked.requestedPointerShape == mPolicy->getDefaultPointerIconId()) {
                 mLocked.pointerSprite->setIcon(mLocked.pointerIcon);
             } else {
                 std::map<int, SpriteIcon>::const_iterator iter =
diff --git a/libs/input/PointerController.h b/libs/input/PointerController.h
index 308ff12..24a1681 100644
--- a/libs/input/PointerController.h
+++ b/libs/input/PointerController.h
@@ -58,7 +58,8 @@
 
 public:
     virtual void loadPointerResources(PointerResources* outResources) = 0;
-    virtual void loadAdditionalMouseResources(std::map<int, SpriteIcon>* outResources) = 0;
+    virtual void loadAdditionalMouseResources(std::map<int32_t, SpriteIcon>* outResources) = 0;
+    virtual int32_t getDefaultPointerIconId() = 0;
 };