dumpsys: Print total DMA-BUFs exported from the DMA-BUF heaps framework

This patch adds the total size of DMA-BUFs exported from the DMA-BUF
heaps framework to dumpsys meminfo.

Bug: 167709539
Test: adb shell dumpsys meminfo
Change-Id: I153721a0dc91ee5084a446ba1ce4f8ec9c51c4f0
Merged-In: I153721a0dc91ee5084a446ba1ce4f8ec9c51c4f0

core/java/android/os/Debug.java

@@ -2559,6 +2559,14 @@ public final class Debug
      */
     public static native long getDmabufTotalExportedKb();
 
+    /**
+     * Return total memory size in kilobytes for DMA-BUFs exported from the DMA-BUF
+     * heaps frameworks or -1 in the case of an error.
+     *
+     * @hide
+     */
+    public static native long getDmabufHeapTotalExportedKb();
+
     /**
      * Return memory size in kilobytes allocated for ION heaps or -1 if
      * /sys/kernel/ion/total_heaps_kb could not be read.