s/gpr_slice/grpc_slice, and move around tests, impls
diff --git a/include/grpc/impl/codegen/gpr_types.h b/include/grpc/impl/codegen/gpr_types.h
index c8f0815..ed9976f 100644
--- a/include/grpc/impl/codegen/gpr_types.h
+++ b/include/grpc/impl/codegen/gpr_types.h
@@ -68,71 +68,6 @@
   gpr_clock_type clock_type;
 } gpr_timespec;
 
-/* Slice API
-
-   A slice represents a contiguous reference counted array of bytes.
-   It is cheap to take references to a slice, and it is cheap to create a
-   slice pointing to a subset of another slice.
-
-   The data-structure for slices is exposed here to allow non-gpr code to
-   build slices from whatever data they have available.
-
-   When defining interfaces that handle slices, care should be taken to define
-   reference ownership semantics (who should call unref?) and mutability
-   constraints (is the callee allowed to modify the slice?) */
-
-/* Reference count container for gpr_slice. Contains function pointers to
-   increment and decrement reference counts. Implementations should cleanup
-   when the reference count drops to zero.
-   Typically client code should not touch this, and use gpr_slice_malloc,
-   gpr_slice_new, or gpr_slice_new_with_len instead. */
-typedef struct gpr_slice_refcount {
-  void (*ref)(void *);
-  void (*unref)(void *);
-} gpr_slice_refcount;
-
-#define GPR_SLICE_INLINED_SIZE (sizeof(size_t) + sizeof(uint8_t *) - 1)
-
-/* A gpr_slice s, if initialized, represents the byte range
-   s.bytes[0..s.length-1].
-
-   It can have an associated ref count which has a destruction routine to be run
-   when the ref count reaches zero (see gpr_slice_new() and grp_slice_unref()).
-   Multiple gpr_slice values may share a ref count.
-
-   If the slice does not have a refcount, it represents an inlined small piece
-   of data that is copied by value. */
-typedef struct gpr_slice {
-  struct gpr_slice_refcount *refcount;
-  union {
-    struct {
-      uint8_t *bytes;
-      size_t length;
-    } refcounted;
-    struct {
-      uint8_t length;
-      uint8_t bytes[GPR_SLICE_INLINED_SIZE];
-    } inlined;
-  } data;
-} gpr_slice;
-
-#define GRPC_SLICE_BUFFER_INLINE_ELEMENTS 8
-
-/* Represents an expandable array of slices, to be interpreted as a
-   single item. */
-typedef struct {
-  /* slices in the array */
-  gpr_slice *slices;
-  /* the number of slices in the array */
-  size_t count;
-  /* the number of slices allocated in the array */
-  size_t capacity;
-  /* the combined length of all slices in the array */
-  size_t length;
-  /* inlined elements to avoid allocations */
-  gpr_slice inlined[GRPC_SLICE_BUFFER_INLINE_ELEMENTS];
-} gpr_slice_buffer;
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/grpc/impl/codegen/grpc_types.h b/include/grpc/impl/codegen/grpc_types.h
index d2dce0d..cbd484b 100644
--- a/include/grpc/impl/codegen/grpc_types.h
+++ b/include/grpc/impl/codegen/grpc_types.h
@@ -35,6 +35,7 @@
 #define GRPC_IMPL_CODEGEN_GRPC_TYPES_H
 
 #include <grpc/impl/codegen/gpr_types.h>
+#include <grpc/impl/codegen/slice.h>
 
 #include <grpc/impl/codegen/compression_types.h>
 #include <grpc/impl/codegen/status.h>
@@ -60,7 +61,7 @@
     } reserved;
     struct {
       grpc_compression_algorithm compression;
-      gpr_slice_buffer slice_buffer;
+      grpc_slice_buffer slice_buffer;
     } raw;
   } data;
 } grpc_byte_buffer;
diff --git a/include/grpc/impl/codegen/slice.h b/include/grpc/impl/codegen/slice.h
index a2637ee..79297ce 100644
--- a/include/grpc/impl/codegen/slice.h
+++ b/include/grpc/impl/codegen/slice.h
@@ -35,6 +35,72 @@
 #define GRPC_IMPL_CODEGEN_SLICE_H
 
 #include <stddef.h>
+#include <stdint.h>
+
+/* Slice API
+
+   A slice represents a contiguous reference counted array of bytes.
+   It is cheap to take references to a slice, and it is cheap to create a
+   slice pointing to a subset of another slice.
+
+   The data-structure for slices is exposed here to allow non-gpr code to
+   build slices from whatever data they have available.
+
+   When defining interfaces that handle slices, care should be taken to define
+   reference ownership semantics (who should call unref?) and mutability
+   constraints (is the callee allowed to modify the slice?) */
+
+/* Reference count container for grpc_slice. Contains function pointers to
+   increment and decrement reference counts. Implementations should cleanup
+   when the reference count drops to zero.
+   Typically client code should not touch this, and use grpc_slice_malloc,
+   grpc_slice_new, or grpc_slice_new_with_len instead. */
+typedef struct grpc_slice_refcount {
+  void (*ref)(void *);
+  void (*unref)(void *);
+} grpc_slice_refcount;
+
+#define GPR_SLICE_INLINED_SIZE (sizeof(size_t) + sizeof(uint8_t *) - 1)
+
+/* A grpc_slice s, if initialized, represents the byte range
+   s.bytes[0..s.length-1].
+
+   It can have an associated ref count which has a destruction routine to be run
+   when the ref count reaches zero (see grpc_slice_new() and grp_slice_unref()).
+   Multiple grpc_slice values may share a ref count.
+
+   If the slice does not have a refcount, it represents an inlined small piece
+   of data that is copied by value. */
+typedef struct grpc_slice {
+  struct grpc_slice_refcount *refcount;
+  union {
+    struct {
+      uint8_t *bytes;
+      size_t length;
+    } refcounted;
+    struct {
+      uint8_t length;
+      uint8_t bytes[GPR_SLICE_INLINED_SIZE];
+    } inlined;
+  } data;
+} grpc_slice;
+
+#define GRPC_SLICE_BUFFER_INLINE_ELEMENTS 8
+
+/* Represents an expandable array of slices, to be interpreted as a
+   single item. */
+typedef struct {
+  /* slices in the array */
+  grpc_slice *slices;
+  /* the number of slices in the array */
+  size_t count;
+  /* the number of slices allocated in the array */
+  size_t capacity;
+  /* the combined length of all slices in the array */
+  size_t length;
+  /* inlined elements to avoid allocations */
+  grpc_slice inlined[GRPC_SLICE_BUFFER_INLINE_ELEMENTS];
+} grpc_slice_buffer;
 
 #define GPR_SLICE_START_PTR(slice)                  \
   ((slice).refcount ? (slice).data.refcounted.bytes \