Integrate syzygy (optionally) into the chrome build process.

chrome/chrome_dll.gypi

 # Copyright (c) 2011 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.
 {
   'target_defaults': {
     'variables': {
       'chrome_dll_target': 0,
     },
     'target_conditions': [
       ['chrome_dll_target==1', {
@@ skipping 45 matching lines @@
             },
           }],  # OS=="win"
         ],  # conditions
       }],
     ],
   },
   'conditions': [
     ['OS=="mac" or OS=="win"', {
       'targets': [
         {
-          'target_name': 'chrome_dll',
+          'variables': {

[M-A Ruel, 2011/08/02 15:25:14]

I think it warrants a small comment explaining why you are doing this. I know
why but it may not be clear for anyone else.

[Roger McFarlane (Google), 2011/08/03 16:22:28]

Done.

+            'variables': {
+              'optimize_with_syzygy%': 0,
+            },
+            'chrome_dll_target': 1,
+            'conditions' : [
+              ['OS=="win" and optimize_with_syzygy==1', {
+                'dll_target_name': 'original_chrome_dll',
+              }, {
+                'dll_target_name': 'chrome_dll',
+              }],
+            ],
+          },
+          'target_name': '<(dll_target_name)',
           'type': 'shared_library',
-          'variables': {
-            'chrome_dll_target': 1,
-          },
           'dependencies': [
             '<@(chromium_dependencies)',
             'app/policy/cloud_policy_codegen.gyp:policy',
           ],
           'conditions': [
             ['OS=="win"', {
               'product_name': 'chrome',
               'dependencies': [
                 # On Windows, link the dependencies (libraries) that make
                 # up actual Chromium functionality into this .dll.
@@ skipping 45 matching lines @@
                 '<(SHARED_INTERMEDIATE_DIR)/webkit/webkit_resources.rc',
 
                 # TODO(sgk):  left-over from pre-gyp build, figure out
                 # if we still need them and/or how to update to gyp.
                 #'app/check_dependents.bat',
                 #'app/chrome.dll.deps',
               ],
               'msvs_settings': {
                 'VCLinkerTool': {
                   'ImportLibrary': '$(OutDir)\\lib\\chrome_dll.lib',
-                  'ProgramDatabaseFile': '$(OutDir)\\chrome_dll.pdb',
+                  # This corresponds to the /PROFILE flag which ensures
+                  # the PDB file contains FIXUP information.
+                  'Profile': 'true',
+                  'conditions' : [
+                    ['optimize_with_syzygy==1', {
+                      'ProgramDatabaseFile': '$(OutDir)\\original\\chrome_dll.pdb',
+                      'OutputFile': '$(OutDir)\\original\chrome.dll'
+                    }, {
+                      'ProgramDatabaseFile': '$(OutDir)\\chrome_dll.pdb',
+                    }],
+                  ],
                 },
               },
             }],  # OS=="win"
             ['OS=="mac"', {
               # The main browser executable's name is <(mac_product_name).
               # Certain things will get confused if two modules in the
               # executable share the same name, so append " Framework" to the
               # product_name used for the framework.  This will result in
               # a name like "Chromium Framework.framework".
               'product_name': '<(mac_product_name) Framework',
@@ skipping 565 matching lines @@
                   'LinkIncremental': '<(msvs_debug_link_nonincremental)',
                 },
               },
             },
           },
         },  # target chrome_dll
       ],
     }],
   ],
 }