InputDispatcher: Fix support for INPUT_FEATURE_NO_INPUT_CHANNEL

In preparation for an occlusion detection fix, we are going to begin
sending windows with NO_INPUT_CHANNEL to InputFlinger. There are 3
obstacles we address here:
   1. InputDispatcher ignores windows with no InputChannel when updating
      input windows. We modify the code to allow such windows if they have
      INPUT_FEATURE_NO_INPUT_CHANNEL.
   2. The parcelling code currently has an optimization to avoid sending the rest
      of the fields if token is null. We rebase this optimization on
      whether or not a name is set.
   3. InputWindowHandle::getName checks if there is a token to consider the window
      invalid. We instead check if a name is set.

Bug: 152064592
Test: Existing tests pass
Change-Id: I8a85f46b6c44866c7f73daafa5e8ff4c9251c366
diff --git a/include/input/InputWindow.h b/include/input/InputWindow.h
index edaf8f5..a695a8f 100644
--- a/include/input/InputWindow.h
+++ b/include/input/InputWindow.h
@@ -213,7 +213,7 @@
     }
 
     inline std::string getName() const {
-        return mInfo.token ? mInfo.name : "<invalid>";
+        return !mInfo.name.empty() ? mInfo.name : "<invalid>";
     }
 
     inline nsecs_t getDispatchingTimeout(nsecs_t defaultValue) const {