Add support for create_installer_archive.py to generate a depfile

chrome/installer/mini_installer.gyp

Index: chrome/installer/mini_installer.gyp
diff --git a/chrome/installer/mini_installer.gyp b/chrome/installer/mini_installer.gyp
index e6b0ca7cc8de3a0854f4578dcc1733d79df81eba..f2caec6db1d0cfd75e7f938d64b1bb1de494c596 100644
--- a/chrome/installer/mini_installer.gyp
+++ b/chrome/installer/mini_installer.gyp
@@ -192,7 +192,7 @@
                     'component_build_flag': '',
                   },
                   'outputs': [
-                    '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).packed.7z',

[scottmg, 2015/01/29 23:32:41]

this expanded to "chrome.release.packed.7z" which was never generated, i assume
accidentally.

+                    '<(PRODUCT_DIR)/chrome.packed.7z',
                   ],
                 }],
                 ['disable_nacl==1', {
@@ -243,11 +243,13 @@
               'outputs': [
                 # Also note that chrome.packed.7z is defined as an output in a
                 # conditional above.
-                'xxx2.out',

[scottmg, 2015/01/29 23:32:41]

this was to force an always-build which we're trying to avoid

-                '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).7z',

[scottmg, 2015/01/29 23:32:41]

same as .packed.7z above

+                '<(PRODUCT_DIR)/chrome.7z',
                 '<(PRODUCT_DIR)/setup.ex_',
                 '<(INTERMEDIATE_DIR)/packed_files.rc',
               ],
+              'depfile': [
+                '<(INTERMEDIATE_DIR)/installer_archive.d',

[scottmg, 2015/01/29 23:32:41]

this doesn't work yet (gyp only supports it on actions, not rules)

+              ],
               'action': [
                 'python',
                 '<(create_installer_archive_py_path)',
@@ -255,6 +257,7 @@
                 '--staging_dir', '<(INTERMEDIATE_DIR)',
                 '--input_file', '<(RULE_INPUT_PATH)',
                 '--resource_file_path', '<(INTERMEDIATE_DIR)/packed_files.rc',
+                '--depfile', '<(INTERMEDIATE_DIR)/installer_archive.d',
                 '<(enable_hidpi_flag)',
                 '<(component_build_flag)',
                 '<(target_arch_flag)',