Move core/profiling/timers_preciseclock.h to core/support/ such that we
have a gpr public function which returns cycle clock.
diff --git a/gRPC.podspec b/gRPC.podspec
index d945c29..df0ba6d 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -68,6 +68,7 @@
                       'src/core/support/grpc_string.h',
                       'src/core/support/string_win32.h',
                       'src/core/support/thd_internal.h',
+                      'src/core/support/time_precise.h',
                       'grpc/support/alloc.h',
                       'grpc/support/atm.h',
                       'grpc/support/atm_gcc_atomic.h',
@@ -210,7 +211,6 @@
                       'src/core/json/json_reader.h',
                       'src/core/json/json_writer.h',
                       'src/core/profiling/timers.h',
-                      'src/core/profiling/timers_preciseclock.h',
                       'src/core/surface/byte_buffer_queue.h',
                       'src/core/surface/call.h',
                       'src/core/surface/channel.h',
@@ -401,6 +401,7 @@
                               'src/core/support/string.h',
                               'src/core/support/string_win32.h',
                               'src/core/support/thd_internal.h',
+                              'src/core/support/time_precise.h',
                               'src/core/security/auth_filters.h',
                               'src/core/security/base64.h',
                               'src/core/security/credentials.h',
@@ -479,7 +480,6 @@
                               'src/core/json/json_reader.h',
                               'src/core/json/json_writer.h',
                               'src/core/profiling/timers.h',
-                              'src/core/profiling/timers_preciseclock.h',
                               'src/core/surface/byte_buffer_queue.h',
                               'src/core/surface/call.h',
                               'src/core/surface/channel.h',