Add ashmem stats to Parcels

Requires change Ifaf115da in frameworks/base.

Bug: 20079551
Change-Id: Ifaf115dabd1a59cdb1b46e2d49c41f64ac107de4

include/binder/Parcel.h

@@ -337,6 +337,12 @@ public:
     public:
         inline void* data() { return mData; }
     };
+
+private:
+    size_t mBlobAshmemSize;
+
+public:
+    size_t getBlobAshmemSize() const;
 };
 
 // ---------------------------------------------------------------------------

libs/binder/Parcel.cpp

@@ -938,6 +938,8 @@ status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob)
     int fd = ashmem_create_region("Parcel Blob", len);
     if (fd < 0) return NO_MEMORY;
 
+    mBlobAshmemSize += len;
+
     int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
     if (result < 0) {
         status = result;
@@ -1901,6 +1903,7 @@ void Parcel::initState()
     mFdsKnown = true;
     mAllowFds = true;
     mOwner = NULL;
+    mBlobAshmemSize = 0;
 }
 
 void Parcel::scanForFds() const
@@ -1918,6 +1921,11 @@ void Parcel::scanForFds() const
     mFdsKnown = true;
 }
 
+size_t Parcel::getBlobAshmemSize() const
+{
+    return mBlobAshmemSize;
+}
+
 // --- Parcel::Blob ---
 
 Parcel::Blob::Blob() :