Allow xctests to embed themselves in their TEST_HOST for Xcode 7.3 support.

ios/web/ios_web_shell_tests.gyp

 # Copyright 2016 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'conditions': [
     # The iOS frameworks being built for ios_web_shell_test require certs which
     # bots do not currently have installed.  Ninja allows this, Xcode does not.
     ['"<(GENERATOR)"=="ninja" or "<(GENERATOR_FLAVOR)"=="ninja"', {
       'targets': [
         {
           'variables': {
             'test_host': 'ios_web_shell.app/ios_web_shell',
+            'test_host_name': 'ios_web_shell',
           },
           'target_name': 'ios_web_shell_test',
           'type': 'loadable_module',
           'mac_xctest_bundle': 1,
           'dependencies': [
             '../third_party/earl_grey/earl_grey.gyp:EarlGrey',
             'ios_web_shell.gyp:ios_web_shell',
           ],
           'sources': [
             'shell/test/web_shell_navigation_egtest.mm',
           ],
           'xcode_settings': {
             'WRAPPER_EXTENSION': 'xctest',
-            'TEST_HOST': '<(test_host)',
+            'TEST_HOST': '$(CONFIGURATION_BUILD_DIR)/<(test_host)',
             'BUNDLE_LOADER': '$(TEST_HOST)',
             'conditions':[
               ['"<(GENERATOR)"!="xcode" or "<(GENERATOR_FLAVOR)"=="ninja"', {
                 'OTHER_LDFLAGS': [
                   '-bundle_loader <@(test_host)',
                 ],
               }],
             ],
           },
           'link_settings': {
             'libraries': [
               'CoreGraphics.framework',
               'Foundation.framework',
               'QuartzCore.framework',
               'UIKit.framework',
               'XCTest.framework',
             ],
           },
+          'postbuilds': [
+            {
+              'postbuild_name': 'Copy xctest to TEST_HOST',
+              'action': [
+                'ditto',
+                '${BUILT_PRODUCTS_DIR}/ios_web_shell_test.xctest',

[baxley, 2016/04/14 21:48:49]

are there two copies of xctest to make sure it works on 7.3 and pre-7.3? Or is
it for some other reason?

If it's the former, would it make sense to have a bug to track removing this
one?

+                '${BUILT_PRODUCTS_DIR}/<(test_host_name).app/PlugIns/ios_web_shell_test.xctest',
+              ],
+            },
+          ],
         },
       ],
     }, { # GENERATOR == ninja or GENERATOR_FLAVOR == ninja
       'targets': [
         {
           # The iOS frameworks being built for ios_web_shell_test require certs
           # which bot do not currently have installed.  Ninja allows this, Xcode
           # does not.
           'target_name': 'ios_web_shell_test',
           'type': 'none',
         },
       ],
     }],
   ],
 }