android_webview: support building a stub WebView.

build/config/android/rules.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Do not add any imports to non-//build directories here.
 # Some projects (e.g. V8) do not have non-build directories DEPS'ed in.
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/dcheck_always_on.gni")
@@ skipping 1446 matching lines @@
   #     dependencies will also be included in the apk (e.g. for is_component_build).
   #   native_lib_placeholders: List of placeholder filenames to add to the apk
   #     (optional).
   #   apk_under_test: For an instrumentation test apk, this is the target of the
   #     tested apk.
   #   include_all_resources - If true include all resource IDs in all generated
   #     R.java files.
   #   testonly: Marks this target as "test-only".
   #   write_asset_list: Adds an extra file to the assets, which contains a list of
   #     all other asset files.
+  #   generate_buildconfig_java: If defined and false, skip generating the
+  #     BuildConfig java class describing the build configuration. The default
+  #     is true.

[jbudorick, 2017/02/28 16:36:27]

nit: mention that the default is true for non-test APKs.

[Torne, 2017/03/01 10:56:29]

Done.

   #   requires_sdk_api_level_23: If defined and true, the apk is intended for
   #     installation only on Android M or later. In these releases the system
   #     linker does relocation unpacking, so we can enable it unconditionally.
   #   secondary_native_libs (deprecated): The path of native libraries for secondary
   #     app abi.
   #   run_findbugs_override: Forces run_findbugs on or off. If undefined, the
   #     default will use the build arg run_findbugs.
   #   proguard_jar_path: The path to proguard.jar you wish to use. If undefined,
   #     the proguard used will be the checked in one in //third_party/proguard.
   #   never_incremental: If true, |incremental_apk_by_default| will be ignored.
@@ skipping 191 matching lines @@
     }
     _android_manifest = invoker.android_manifest
 
     _rebased_build_config = rebase_path(_build_config, root_build_dir)
     _create_abi_split =
         defined(invoker.create_abi_split) && invoker.create_abi_split
     _create_density_splits =
         defined(invoker.create_density_splits) && invoker.create_density_splits
     _create_language_splits =
         defined(invoker.language_splits) && invoker.language_splits != []
+    _generate_buildconfig_java = !defined(invoker.apk_under_test)
+    if (defined(invoker.generate_buildconfig_java)) {
+      _generate_buildconfig_java = invoker.generate_buildconfig_java
+    }
 
     # Help GN understand that _create_abi_split is not unused (bug in GN).
     assert(_create_abi_split || true)
 
     _proguard_enabled =
         defined(invoker.proguard_enabled) && invoker.proguard_enabled
     if (_proguard_enabled) {
       _proguard_output_jar_path = "$base_path.proguard.jar"
     }
 
@@ skipping 140 matching lines @@
         if (_load_library_from_apk) {
           defines += [ "ENABLE_CHROMIUM_LINKER_LIBRARY_IN_ZIP_FILE" ]
         }
         if (_enable_chromium_linker_tests) {
           defines += [ "ENABLE_CHROMIUM_LINKER_TESTS" ]
         }
       }
       _srcjar_deps += [ ":${_template_name}__native_libraries_java" ]
     }
 
-    if (!defined(invoker.apk_under_test)) {
+    if (_generate_buildconfig_java) {
       java_cpp_template("${_template_name}__build_config_java") {
         package_name = "org/chromium/base"
         sources = [
           "//base/android/java/templates/BuildConfig.template",
         ]
         deps = [
           ":$build_config_target",
         ]
 
         defines = []
@@ skipping 1035 matching lines @@
         # because in practice they seem to contain classes required to be in the
         # classpath.
         deps += _subjar_targets
       }
       if (defined(_res_target_name)) {
         deps += [ ":$_res_target_name" ]
       }
     }
   }
 }