Move smart deploy to tristate.

BUG=

Review URL: https://codereview.chromium.org/1149383006

Cr-Commit-Position: refs/heads/master@{#333058}
void MarkKeyboardLoadStarted() {
  if (!g_keyboard_load_time_start.Get().ToInternalValue())
    g_keyboard_load_time_start.Get() = base::Time::Now();
}

void MarkKeyboardLoadStarted() {
  if (!g_keyboard_load_time_start.Get().ToInternalValue())
    g_keyboard_load_time_start.Get() = base::Time::Now();
}
