Add bundle_deps_filter to create_bundle targets.

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
@@ skipping 1316 matching lines @@
 
 ### **Examples**
 
 ```
   bundle_data("icudata") {
     sources = [ "sources/data/in/icudtl.dat" ]
     outputs = [ "{{bundle_resources_dir}}/{{source_file_part}}" ]
   }
 
   bundle_data("base_unittests_bundle_data]") {
-    sources = [ "test/data" ]

+    sources = [ "test/data" ]
     outputs = [
       "{{bundle_resources_dir}}/{{source_root_relative_dir}}/" +
           "{{source_file_part}}"
     ]
   }
 
   bundle_data("material_typography_bundle_data") {
     sources = [
       "src/MaterialTypography.bundle/Roboto-Bold.ttf",
       "src/MaterialTypography.bundle/Roboto-Italic.ttf",
@@ skipping 145 matching lines @@
   The code_signing_args will be passed as is to the script (so path have
   to be rebased) and additional inputs may be listed with the variable
   code_signing_sources.
 
 ```
 
 ### **Variables**
 
 ```
   bundle_root_dir*, bundle_resources_dir*, bundle_executable_dir*,
-  bundle_plugins_dir*, deps, data_deps, public_deps, visibility,
-  product_type, code_signing_args, code_signing_script,
+  bundle_plugins_dir*, bundle_deps_filter, deps, data_deps, public_deps,
+  visibility, product_type, code_signing_args, code_signing_script,
   code_signing_sources, code_signing_outputs
   * = required
 
 ```
 
 ### **Example**
 
 ```
   # Defines a template to create an application. On most platform, this
   # is just an alias for an "executable" target, but on iOS/OS X, it
@@ skipping 500 matching lines @@
 
       The result will never end in a slash, so if the resulting
       is empty, the system ("/") or source ("//") roots, a "."
       will be appended such that it is always legal to append a slash
       and a filename and get a valid path.
 
   "out_dir"
       The output file directory corresponding to the path of the
       given file, not including a trailing slash.
         "//foo/bar/baz.txt" => "//out/Default/obj/foo/bar"
+
   "gen_dir"
       The generated file directory corresponding to the path of the
       given file, not including a trailing slash.
         "//foo/bar/baz.txt" => "//out/Default/gen/foo/bar"
 
   "abspath"
       The full absolute path name to the file or directory. It will be
       resolved relative to the current directory, and then the source-
       absolute version will be returned. If the input is system-
       absolute, the same input will be returned.
@@ skipping 2803 matching lines @@
   propagated across all types of targets, and public_configs
   are always propagated across public deps of all types of targets.
 
   Data dependencies are propagated differently. See
   "gn help data_deps" and "gn help runtime_deps".
 
   See also "public_deps".
 
 
 ```
+## **bundle_deps_filter**: [label list] A list of labels that are filtered out.
+
+```
+  A list of target labels.
+
+  This list contains target label patterns that should be filtered out
+  when creating the bundle. Any target matching one of those label will
+  be removed from the dependencies of the create_bundle target.
+
+  This is mostly useful when creating application extension bundle as
+  the application extension has access to runtime resources from the
+  application bundle and thus do not require a second copy.
+
+  See "gn help create_bundle" for more information.
+
+```
+
+### **Example**
+
+```
+  create_bundle("today_extension") {
+    deps = [
+      "//base"
+    ]
+    bundle_root_dir = "$root_out_dir/today_extension.appex"
+    bundle_deps_filter = [
+      # The extension uses //base but does not use any function calling
+      # into third_party/icu and thus does not need the icudtl.dat file.
+      "//third_party/icu:icudata",
+    ]
+  }
+
+
+```
 ## **include_dirs**: Additional include directories.
 
 ```
   A list of source directories.
 
   The directories in this list will be added to the include path for
   the files in the affected target.
 
 ```
 
@@ skipping 1478 matching lines @@
 **  \--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.
 
 ```