Integrate syzygy (optionally) into the chrome build process.

chrome/chrome_dll.gypi

Index: chrome/chrome_dll.gypi
===================================================================
--- chrome/chrome_dll.gypi	(revision 95033)
+++ chrome/chrome_dll.gypi	(working copy)
@@ -63,11 +63,21 @@
     ['OS=="mac" or OS=="win"', {
       'targets': [
         {
-          'target_name': 'chrome_dll',
-          'type': 'shared_library',
           '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',
           'dependencies': [
             '<@(chromium_dependencies)',
             'app/policy/cloud_policy_codegen.gyp:policy',
@@ -133,7 +143,17 @@
               '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"