[fuchsia] Clone UTC clock when launching processes

Fuchsia is transitioning from UTC time being tracked in the kernel,
to userspace UTC clock handles.

This preserves the existing behavior that each chromium process
has access to the global UTC clock.

Bug: 1133580, fuchsia:61060
Change-Id: I8ff3d3033a47814dac1a1dd5946ca1fe872ead13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440983
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Adam Lesinski <adamlesinski@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812678}

base/process/launch_fuchsia.cc

@@ -153,7 +153,8 @@ Process LaunchProcess(const std::vector<std::string>& argv,
   // |clear_environment|, |environment| or |current_directory| are set then we
   // construct a new (possibly empty) environment, otherwise we let fdio_spawn()
   // clone the caller's environment into the new process.
-  uint32_t spawn_flags = FDIO_SPAWN_DEFAULT_LDSVC | options.spawn_flags;
+  uint32_t spawn_flags = FDIO_SPAWN_DEFAULT_LDSVC | FDIO_SPAWN_CLONE_UTC_CLOCK |
+                         options.spawn_flags;
 
   EnvironmentMap environ_modifications = options.environment;
   if (!options.current_directory.empty()) {