Make Timespan namespace shorter.

PiperOrigin-RevId: 279851991
Change-Id: I5a6de3609a0e24425426ddb6837cf942c9410392

tensorflow/core/profiler/utils/BUILD

@@ -1,10 +1,17 @@
 load("//tensorflow:tensorflow.bzl", "tf_cc_test")
 
 package(
-    default_visibility = ["//visibility:public"],
+    default_visibility = ["//tensorflow/core/profiler:internal"],
     licenses = ["notice"],  # Apache 2.0
 )
 
+package_group(
+    name = "friends",
+    includes = [
+        "//tensorflow/core/profiler:friends",
+    ],
+)
+
 cc_library(
     name = "timespan",
     hdrs = ["timespan.h"],
@@ -28,6 +35,7 @@ cc_library(
     name = "xplane_builder",
     srcs = ["xplane_builder.cc"],
     hdrs = ["xplane_builder.h"],
+    visibility = [":friends"],
     deps = [
         "//tensorflow/core/platform:logging",
         "//tensorflow/core/platform:types",

tensorflow/core/profiler/utils/timespan.h

@@ -21,7 +21,6 @@ limitations under the License.
 
 namespace tensorflow {
 namespace profiler {
-namespace utils {
 
 // A Timespan is the time extent of an event: a pair of (begin, duration).
 // Events may have duration 0 ("instant events") but duration can't be negative.
@@ -93,7 +92,6 @@ class Timespan {
   uint64 duration_ps_;  // 0 for an instant event.
 };
 
-}  // namespace utils
 }  // namespace profiler
 }  // namespace tensorflow
 

tensorflow/core/profiler/utils/timespan_test.cc

@@ -19,7 +19,6 @@ limitations under the License.
 
 namespace tensorflow {
 namespace profiler {
-namespace utils {
 
 TEST(TimespanTests, NonInstantSpanIncludesSingleTimeTests) {
   EXPECT_TRUE(Timespan(10, 2).Includes(12));
@@ -81,6 +80,5 @@ TEST(TimespanTests, InstantSpanNonInstantSpanOverlappedDuration) {
   EXPECT_EQ(0, Timespan(12, 0).OverlappedDurationPs(Timespan(8, 16)));
 }
 
-}  // namespace utils
 }  // namespace profiler
 }  // namespace tensorflow