[NaCl SDK] Add HTTP mount.

native_client_sdk/src/libraries/nacl_mounts/library.dsc

 {
   # Disabled pnacl for now because it warns on using the language extension
   # typeof(...)
   #'TOOLS': ['newlib', 'glibc', 'pnacl', 'win'],
   'TOOLS': ['newlib', 'glibc', 'win'],
   'SEARCH': [
     '.',
     'pepper',
     '../utils'
   ],
   'TARGETS': [
     {
       'NAME' : 'nacl_mounts',
       'TYPE' : 'lib',
       'SOURCES' : [
         "kernel_handle.cc",
         "kernel_intercept.cc",
         "kernel_object.cc",
         "kernel_proxy.cc",
         "kernel_wrap.cc",
         "kernel_wrap_glibc.cc",
         "kernel_wrap_newlib.cc",
         "kernel_wrap_win.cc",
         "mount.cc",
         "mount_dev.cc",
         "mount_html5fs.cc",
+        "mount_http.cc",
         "mount_mem.cc",
         "mount_node.cc",
         "mount_node_dir.cc",
         "mount_node_html5fs.cc",
         "mount_node_mem.cc",
         "nacl_mounts.cc",
         "path.cc",
         "pepper_interface.cc",
         "real_pepper_interface.cc",
       ],
     }
   ],
   'HEADERS': [
     {
       'FILES': [
         "kernel_handle.h",
         "kernel_intercept.h",
         "kernel_object.h",
         "kernel_proxy.h",
         "kernel_wrap.h",
         "mount.h",
         "mount_dev.h",
         "mount_html5fs.h",
+        "mount_http.h",
         "mount_mem.h",
         "mount_node_dir.h",
         "mount_node.h",
         "mount_node_html5fs.h",
         "mount_node_mem.h",
         "nacl_mounts.h",
         "osdirent.h",
         "osstat.h",
         "ostypes.h",
         "path.h",
@@ skipping 15 matching lines @@
         "auto_lock.h",
         "macros.h",
         "ref_object.h"
       ],
       'DEST': 'include/utils',
     }
   ],
   'DEST': 'src',
   'NAME': 'nacl_mounts',
 }