Add ctor with no arguments for TensorImage.

PiperOrigin-RevId: 297984962
Change-Id: Iaab4589ecb8b468807c9edd0ae50a411602c6f31

tensorflow/lite/experimental/support/java/src/java/org/tensorflow/lite/support/image/TensorImage.java

@@ -48,6 +48,17 @@ public class TensorImage {
 
   private final ImageContainer container;
 
+  /**
+   * Initialize a TensorImage object.
+   *
+   * Note: The data type of this TensorImage is UINT8, which means it could naturally accept Bitmaps
+   * whose pixel value range is [0, 255]. However, any image with float value pixels will not be
+   * loaded correctly. In those cases, please use {@link TensorImage(DataType)}.
+   */
+  public TensorImage() {
+    this(DataType.UINT8);
+  }
+
   /**
    * Initializes a TensorImage object with data type specified.
    *