Add total DMA-BUF heap pool size information to dumpsys meminfo

Some DMA-BUF heaps maintain pools of pre-zeroed memory for faster
allocations. Print the total size of all DMA-BUF heap pools as part of
dumpsys meminfo and use the same in LostRam calculation.

Test: dumpsys meminfo
Bug: 167709539
Change-Id: Ifb61fe596c1a8fab1bd536ec904285e532629b71
Merged-In: Ifb61fe596c1a8fab1bd536ec904285e532629b71

core/java/android/os/Debug.java

@@ -2566,6 +2566,14 @@ public final class Debug
      */
     public static native long getIonHeapsSizeKb();
 
+    /**
+     * Return memory size in kilobytes allocated for DMA-BUF heap pools or -1 if
+     * /sys/kernel/dma_heap/total_pools_kb could not be read.
+     *
+     * @hide
+     */
+    public static native long getDmabufHeapPoolsSizeKb();
+
     /**
      * Return memory size in kilobytes allocated for ION pools or -1 if
      * /sys/kernel/ion/total_pools_kb could not be read.