Merge "Apply contextStart consistently in getRunAdvance" into mnc-dev

        // TODO performance: optimize JNI array access

        jchar* textArray = env->GetCharArrayElements(text, NULL);

        jfloat result = doRunAdvance(paint, typeface, textArray + contextStart,

                start - contextStart, end - start, contextEnd - contextStart, isRtl, offset);

                start - contextStart, end - start, contextEnd - contextStart, isRtl,

                offset - contextStart);

        env->ReleaseCharArrayElements(text, textArray, JNI_ABORT);

        return result;

    }