Fix various issues with `gn analyze`.

tools/gn/docs/reference.md

 # GN Reference
 
 *This page is automatically generated from* `gn help --markdown all`.
 
 ## **\--args**: Specifies build arguments overrides.
 
 ```
   See "gn help buildargs" for an overview of how build arguments work.
 
   Most operations take a build directory. The build arguments are taken
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   This command takes three arguments:
 
   out_dir is the path to the build directory.
 
   input_path is a path to a file containing a JSON object with three
   fields:
 
    - "files": A list of the filenames to check.
 
-   - "compile_targets": A list of the labels targets that we wish to
-     rebuild, but aren't necessarily needed for testing. The
-     important difference between this field and "test_targets"
-     is that if an item in the compile_targets list is a group, then
+   - "test_targets": A list of the labels for targets that
+     are needed to run the tests we wish to run.
+
+   - "additional_compile_targets": A list of the labels for
+     targets that we wish to rebuild, but aren't necessarily needed
+     for testing. The important difference between this field and
+     "test_targets" is that if an item in the
+     additional_compile_targets list refers to a group, then
      any dependencies of that group will be returned if they are out
      of date, but the group itself does not need to be. If the
      dependencies themselves are groups, the same filtering is
      repeated. This filtering can be used to avoid rebuilding
      dependencies of a group that are unaffected by the input files.
-     The list may contain the string "all" to refer to a
-     pseudo-group that contains every root target in the build graph.
+     The list may also contain the string "all" to refer to a
+     pseudo-group that contains every root target in the build
+     graph.
 
      This filtering behavior is also known as "pruning" the list
      of compile targets.
 
-   - "test_targets": A list of the labels for targets that
-     are needed to run the tests we wish to run. Unlike
-     "compile_targets", this list may not contain the string "all",
-     because having a test be dependent on everything in the build
-     would be silly.
-
   output_path is a path indicating where the results of the command
   are to be written. The results will be a file containing a JSON
   object with one or more of following fields:
 
    - "compile_targets": A list of the labels derived from the input
      compile_targets list that are affected by the input files.
      Due to the way the filtering works for compile targets as
      described above, this list may contain targets that do not appear
      in the input list.
 
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 **  \--root**: Explicitly specify source root.
 **  \--runtime-deps-list-file**: Save runtime dependencies for targets in file.
 **  \--script-executable**: Set the executable used to execute scripts.
 **  \--threads**: Specify number of worker threads.
 **  \--time**: Outputs a summary of how long everything took.
 **  \--tracelog**: Writes a Chrome-compatible trace log to the given file.
 **  -v**: Verbose logging.
 **  \--version**: Prints the GN version number and exits.
 
 ```