Give plug-in processes an executable heap and disable PIE/ASLR for Native

chrome/chrome_exe.gypi

Index: chrome/chrome_exe.gypi
===================================================================
--- chrome/chrome_exe.gypi	(revision 97870)
+++ chrome/chrome_exe.gypi	(working copy)
@@ -273,6 +273,7 @@
           'dependencies': [
             'helper_app',
             'infoplist_strings_tool',
+            'interpose_dependency_shim',
             'chrome_manifest_bundle',
           ],
           'mac_bundle_resources': [
@@ -327,6 +328,7 @@
               'destination': '<(PRODUCT_DIR)/<(mac_product_name).app/Contents/Versions/<(version_full)',
               'files': [
                 '<(PRODUCT_DIR)/<(mac_product_name) Helper.app',
+                '<(PRODUCT_DIR)/libplugin_carbon_interpose.dylib',
               ],
             },
           ],
@@ -366,6 +368,14 @@
                 '<(version_full)'
               ],
             },
+            {
+              'postbuild_name': 'Make More Helpers',
+              'action': [
+                'tools/build/mac/make_more_helpers.sh',
+                '<(version_full)',
+                '<(mac_product_name)',
+              ],
+            },
           ],  # postbuilds
         }],
         ['OS=="linux"', {