Fix memory leak of SkMovie class

Movie class doesn't have finalize method.
So memory leak of SkMovie class of native Skia occurs when Movie class is released.
I add finalize method to Movie class (Movie.java) and jni destructor method to SkMovie class (Movie.cpp).

Change-Id: I4dae9dd95f128cbfade50bef978b219ba99321dd

core/jni/android/graphics/Movie.cpp

@@ -115,6 +115,10 @@ static jobject movie_decodeByteArray(JNIEnv* env, jobject clazz,
     return create_jmovie(env, moov);
 }
 
+static void movie_destructor(JNIEnv* env, jobject, SkMovie* movie) {
+    delete movie;
+}
+
 //////////////////////////////////////////////////////////////////////////////////////////////
 
 #include <android_runtime/AndroidRuntime.h>
@@ -129,6 +133,7 @@ static JNINativeMethod gMethods[] = {
                             (void*)movie_draw  },
     { "decodeStream", "(Ljava/io/InputStream;)Landroid/graphics/Movie;",
                             (void*)movie_decodeStream },
+    { "nativeDestructor","(I)V", (void*)movie_destructor },
     { "decodeByteArray", "([BII)Landroid/graphics/Movie;",
                             (void*)movie_decodeByteArray },
 };

graphics/java/android/graphics/Movie.java

@@ -46,6 +46,8 @@ public class Movie {
     public static native Movie decodeByteArray(byte[] data, int offset,
                                                int length);
 
+    private static native void nativeDestructor(int nativeMovie);
+
     public static Movie decodeFile(String pathName) {
         InputStream is;
         try {
@@ -57,6 +59,15 @@ public class Movie {
         return decodeTempStream(is);
     }
 
+    @Override
+    protected void finalize() throws Throwable {
+        try {
+            nativeDestructor(mNativeMovie);
+        } finally {
+            super.finalize();
+        }
+    }
+
     private static Movie decodeTempStream(InputStream is) {
         Movie moov = null;
         try {