Start of build config for custom user32 import libs.

chrome/chrome_dll.gypi

Index: chrome/chrome_dll.gypi
diff --git a/chrome/chrome_dll.gypi b/chrome/chrome_dll.gypi
index 818f01b60f1cc39d5d23c258f5ec8d43b652cb83..cee633bd8e3ca6cbe80729ba67e2b8ae1c3f8b12 100644
--- a/chrome/chrome_dll.gypi
+++ b/chrome/chrome_dll.gypi
@@ -96,6 +96,7 @@
                 'chrome_dll_pdb_workaround',
                 'chrome_resources.gyp:chrome_resources',
                 'chrome_version_resources',
+                'user32_import_libs',
                 '../chrome/chrome_resources.gyp:chrome_unscaled_resources',
                 '../content/content.gyp:content_worker',
                 '../crypto/crypto.gyp:crypto',
@@ -112,6 +113,8 @@
                 'app/chrome_main.cc',
                 'app/chrome_main_delegate.cc',
                 'app/chrome_main_delegate.h',
+                'app/delay_load_hook.cc',
+                'app/delay_load_hook.h',
 
                 '<(SHARED_INTERMEDIATE_DIR)/chrome_version/chrome_dll_version.rc',
                 '../base/win/dllmain.cc',
@@ -287,6 +290,65 @@
             }],
           ],
         },
+        {
+          # This target builds import libraries for user32, to allow separating
+          # the few post Win-XP imports we use as delay imports, from the
+          # XP-level imports we bind explictly.
+          'target_name': 'user32_import_libs',
+          'type': 'none',
+          'sources': [
+            'imports/build_import_libraries.py',
+            'imports/user32.imports.json',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/lib/user32-imports.lib',
+            '<(PRODUCT_DIR)/lib/user32-delay.lib',
+          ],
+          'actions': [
+            {
+              'action_name': 'user32_imports',
+              'message': 'Building import libraries for user32.dll',
+              'inputs': [
+                'imports/user32.imports.json',
+              ],
+              'outputs':  [
+                '<(PRODUCT_DIR)/lib/user32-imports.lib',
+                '<(PRODUCT_DIR)/lib/user32-delay.lib',
+              ],
+              'action': [
+                'python',
+                'imports/build_import_libraries.py',
+                '--verbose',
+                '<@(_inputs)',
+                '--output-dir', '<(PRODUCT_DIR)/lib/',
+              ],
+              'msvs_cygwin_shell': 0,
+            },
+          ],
+          # TODO(siggi): This should be happening only for release builds,
+          #    how to wrangle that? DO NOT SUBMIT.
+          'direct_dependent_settings': {
+            'msvs_settings': {
+              'VCLinkerTool': {
+                # Ignore the user32.dll import library.
+                'IgnoreDefaultLibraryNames': ['user32.lib'],
+                # Add our custom-made import libraries.
+                'AdditionalDependencies': [
+                  '<(PRODUCT_DIR)/lib/user32-imports.lib',
+                  '<(PRODUCT_DIR)/lib/user32-delay.lib',
+                ],
+                # Delay load only the latter of the import libs above.
+                'DelayLoadDLLs': [
+                  'user32-delay.dll',
+                ],
+                # Make sure the delay load hook is linked into the image.
+                # This will ensure that the delay hook pointer is also linked
+                # from the corresponding .obj file.
+                'ForceSymbolReferences': [ 'ChromeDelayLoadHook' ],
+              },
+            },
+          },
+        },
       ],
     }],
   ],