AArch64: Make graphics classes 64-bit compatible

Changes in this patch include

[x] Long is used to store native pointers as they can
    be 64-bit.

[x] Some minor changes have been done to conform with
    standard JNI practice (e.g. use of jint instead of int
    in JNI function prototypes)

[x] AssetAtlasManager is not completely 64-bit compatible
    yet. Specifically mAtlasMap member has to be converted
    to hold native pointer using long. Added a TODO to
    AssetAtlasManager.java to indicate the change required.

Change-Id: I940433f601c6db998c1a8ffff338f5361200d5ed
Signed-off-by: Ashok Bhat <ashok.bhat@arm.com>
Signed-off-by: Craig Barber <craig.barber@arm.com>
Signed-off-by: Kévin PETIT <kevin.petit@arm.com>
Signed-off-by: Marcus Oakland <marcus.oakland@arm.com>

graphics/java/android/graphics/BitmapFactory.java

@@ -583,7 +583,7 @@ public class BitmapFactory {
         Trace.traceBegin(Trace.TRACE_TAG_GRAPHICS, "decodeBitmap");
         try {
             if (is instanceof AssetManager.AssetInputStream) {
-                final int asset = ((AssetManager.AssetInputStream) is).getAssetInt();
+                final long asset = ((AssetManager.AssetInputStream) is).getNativeAsset();
                 bm = nativeDecodeAsset(asset, outPadding, opts);
             } else {
                 bm = decodeStreamInternal(is, outPadding, opts);
@@ -686,7 +686,7 @@ public class BitmapFactory {
             Rect padding, Options opts);
     private static native Bitmap nativeDecodeFileDescriptor(FileDescriptor fd,
             Rect padding, Options opts);
-    private static native Bitmap nativeDecodeAsset(int asset, Rect padding, Options opts);
+    private static native Bitmap nativeDecodeAsset(long nativeAsset, Rect padding, Options opts);
     private static native Bitmap nativeDecodeByteArray(byte[] data, int offset,
             int length, Options opts);
     private static native boolean nativeIsSeekable(FileDescriptor fd);