[Renderscript] Add check for Allocation.copyTo(Array) and

Fix the input allocation type check for Histogram Intrinsic.

Bug: 19035242
Change-Id: I0ef2672bf816854db90fc92dc9ef51d1d231c246

rs/java/android/renderscript/Allocation.java

@@ -1262,6 +1262,10 @@ public class Allocation extends BaseObj {
 
     private void copyTo(Object array, Element.DataType dt, int arrayLen) {
         Trace.traceBegin(RenderScript.TRACE_TAG, "copyTo");
+        if (dt.mSize * arrayLen < mSize) {
+            throw new RSIllegalArgumentException(
+                "Size of output array cannot be smaller than size of allocation.");
+        }
         mRS.validate();
         mRS.nAllocationRead(getID(mRS), array, dt);
         Trace.traceEnd(RenderScript.TRACE_TAG);