[StreamExecutor] Rename ::perftools::gputools -> ::stream_executor, part 1.

Step 1 of re-namespace'ing StreamExecutor into ::stream_executor.

This moves everything inside of stream_executor/..., and leaves a
namespace alias into ::perftools::gputools.  The next steps will clean
up users to use the new namespace.

This is mostly a mechanical change, but it also includes a bunch of
non-mechanical changes that ideally would be split out into separate
patches.  Unfortunately they all sort of need to be shoved in here for
various reasons:

 - forward declarations need to be in the same namespace as the actual
   types, so we need to change all forward declarations of
   StreamExecutor types in this one patch.

 - Uses of these forward declarations need to be changed to the new
   namespace (or otherwise we need to add a namespace alias to the
   relevant header, but this is pretty ugly).

 - Various initialization code needs to live in StreamExecutor's "real"
   namespace, so all this needs to be changed.

PiperOrigin-RevId: 193256128

1 files changed, 2 insertions, 4 deletions

diff --git a/tensorflow/stream_executor/plugin.cc b/tensorflow/stream_executor/plugin.cc
index 6424658e22..cfbc52ff17 100644
--- a/tensorflow/stream_executor/plugin.cc
+++ b/tensorflow/stream_executor/plugin.cc
@@ -15,8 +15,7 @@ limitations under the License.
 
 #include "tensorflow/stream_executor/plugin.h"
 
-namespace perftools {
-namespace gputools {
+namespace stream_executor {
 
 // Mostly-arbitrary ID only used as a sentinel "not otherwise initialized"
 // value. This value should never [need to] be specified aside by initialization
@@ -51,5 +50,4 @@ PluginConfig& PluginConfig::SetRng(PluginId rng) {
   return *this;
 }
 
-}  // namespace gputools
-}  // namespace perftools
+}  // namespace stream_executor