Add purge all caches to our ashmem wrapper.

THIS IS COMPLETELY UNTESTED


Author: djsollen@google.com

Reviewed By: scroggo@google.com

Review URL: https://chromiumcodereview.appspot.com/12450016

git-svn-id: http://skia.googlecode.com/svn/trunk@8163 2bbb7eff-a529-9590-31e7-b0007b416f81

src/utils/android/ashmem.cpp

@@ -80,3 +80,8 @@ int ashmem_get_size_region(int fd)
 {
   return ioctl(fd, ASHMEM_GET_SIZE, NULL);
 }
+
+int ashmem_purge_all_caches(int fd)
+{
+  return ioctl(fd, ASHMEM_PURGE_ALL_CACHES, NULL);
+}

src/utils/android/ashmem.h

@@ -19,6 +19,7 @@ int ashmem_set_prot_region(int fd, int prot);
 int ashmem_pin_region(int fd, size_t offset, size_t len);
 int ashmem_unpin_region(int fd, size_t offset, size_t len);
 int ashmem_get_size_region(int fd);
+int ashmem_purge_all_caches(int fd);
 
 #ifdef __cplusplus
 }