Need to call RegisterJni for testing.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 623 matching lines @@
         # TODO(csharp): Remove OS!="mac" once xcode can run the isolate code
         # again.
         # NOTE: The check for disable_nacl==0 and component=="static_library"
         # can't be used here because these variables are not defined yet, but it
         # is still not supported.
         ['inside_chromium_build==1 and OS!="mac" and OS!="ios" and OS!="android" and chromeos==0', {
           'test_isolation_mode%': 'check',
         }, {
           'test_isolation_mode%': 'noop',
         }],
+        # Whether Android ARM build uses OpenMAX DL FFT.  Default is
+        # yes.  This will also enable WebAudio on Android ARM.
+        ['OS=="android" and target_arch=="arm"', {
+          'use_openmax_dl_fft%': 1,
+        }, {
+          'use_openmax_dl_fft%': 0,
+        }],
       ],
 
       # Set this to 1 to use the Google-internal file containing
       # official API keys for Google Chrome even in a developer build.
       # Setting this variable explicitly to 1 will cause your build to
       # fail if the internal file is missing.
       #
       # Set this to 0 to not use the internal file, even when it
       # exists in your checkout.
       #
@@ skipping 15 matching lines @@
       # require server-side APIs may fail to work if no keys are
       # provided.
       #
       # Note that if you are building an official build or if
       # use_official_google_api_keys has been set to 1 (explicitly or
       # implicitly), these values will be ignored and the official
       # keys will be used instead.
       'google_api_key%': '',
       'google_default_client_id%': '',
       'google_default_client_secret%': '',
-
-      # Whether Android uses OpenMAX DL FFT.  Default is no.
-      'use_openmax_dl_fft%': 0,
     },
 
     # Copy conditionally-set variables out one scope.
     'branding%': '<(branding)',
     'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'host_arch%': '<(host_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
     'use_aura%': '<(use_aura)',
@@ skipping 3548 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }