Add cursor flags into SpriteController to suppor async cursor updates.

- This is fairly blindly taken from nvidia's implementation.

Change-Id: I825ecbd9cb4b394793dce079591b37efca546bbe

core/java/android/view/SurfaceControl.java

@@ -156,6 +156,11 @@ public class SurfaceControl {
 
     // 0x1000 is reserved for an independent DRM protected flag in framework
 
+    /**
+     * Surface creation flag: Window represents a cursor glyph.
+     */
+    public static final int CURSOR_WINDOW = 0x00002000;
+
     /**
      * Surface creation flag: Creates a normal surface.
      * This is the default.

libs/input/SpriteController.cpp

@@ -370,7 +370,8 @@ sp<SurfaceControl> SpriteController::obtainSurface(int32_t width, int32_t height
 
     sp<SurfaceControl> surfaceControl = mSurfaceComposerClient->createSurface(
             String8("Sprite"), width, height, PIXEL_FORMAT_RGBA_8888,
-            ISurfaceComposerClient::eHidden);
+            ISurfaceComposerClient::eHidden |
+            ISurfaceComposerClient::eCursorWindow);
     if (surfaceControl == NULL || !surfaceControl->isValid()) {
         ALOGE("Error creating sprite surface.");
         return NULL;