Add WebKit.gyp:generate_devtools_zip to the All target.

build/all.gyp

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 31 matching lines @@
         '../third_party/libwebp/libwebp.gyp:*',
         '../third_party/libxml/libxml.gyp:*',
         '../third_party/libxslt/libxslt.gyp:*',
         '../third_party/lzma_sdk/lzma_sdk.gyp:*',
         '../third_party/mesa/mesa.gyp:*',
         '../third_party/modp_b64/modp_b64.gyp:*',
         '../third_party/npapi/npapi.gyp:*',
         '../third_party/ots/ots.gyp:*',
         '../third_party/sqlite/sqlite.gyp:*',
         '../third_party/WebKit/Source/WebKit/chromium/All.gyp:*',
+        '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:generate_devtools_zip',
         '../third_party/zlib/zlib.gyp:*',
         '../v8/tools/gyp/v8.gyp:*',
         '../webkit/support/webkit_support.gyp:*',
         '../webkit/webkit.gyp:*',
         'util/build_util.gyp:*',
         'temp_gyp/googleurl.gyp:*',
         '<(libjpeg_gyp_path):*',
       ],
       'conditions': [
         ['os_posix==1 and OS!="android"', {
@@ skipping 554 matching lines @@
                 '../chrome/chrome.gyp:ui_tests',
                 '../ui/views/views.gyp:views_unittests',
               ],
             }],
           ],
         },
       ],  # targets
     }], # "use_aura==1"
   ], # conditions
 }