MD Downloads: add a use_vulcanize option to Chrome

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 694 matching lines @@
 
       # Whether the entire browser uses toolkit-views on Mac instead of Cocoa.
       'mac_views_browser%': 0,
 
       # By default, use ICU data file (icudtl.dat).
       'icu_use_data_file_flag%': 1,
 
       # Turn on JNI generation optimizations by default.
       'optimize_jni_generation%': 1,
 
+      # Use vulcanized HTML/CSS/JS resources to speed up WebUI (chrome://)
+      # pages. https://github.com/polymer/vulcanize
+      'use_vulcanize%': 1,

[Nico, 2015/12/07 21:29:13]

1. Do you need to do this in gn too?
2. Have you seen "[chromium-dev] Intent to implement: New feature flags system
for the bulid" (sic)? This is now being implemented, maybe it could be used for
this too. (See brettw's recent Google Now feature CL for an example)

[Dan Beam, 2015/12/30 05:07:52]

Done.

+
       'conditions': [
         # A flag for POSIX platforms
         ['OS=="win"', {
           'os_posix%': 0,
         }, {
           'os_posix%': 1,
         }],
 
         # A flag for BSD platforms
         ['OS=="freebsd" or OS=="openbsd"', {
@@ skipping 519 matching lines @@
     'gold_icf_level%': '<(gold_icf_level)',
     'video_hole%': '<(video_hole)',
     'v8_use_external_startup_data%': '<(v8_use_external_startup_data)',
     'cfi_vptr%': '<(cfi_vptr)',
     'cfi_diag%': '<(cfi_diag)',
     'cfi_blacklist%': '<(cfi_blacklist)',
     'mac_views_browser%': '<(mac_views_browser)',
     'android_app_version_name%': '<(android_app_version_name)',
     'android_app_version_code%': '<(android_app_version_code)',
     'enable_webvr%': '<(enable_webvr)',
+    'use_vulcanize%': '<(use_vulcanize)',
 
     # Turns on compiler optimizations in V8 in Debug build.
     'v8_optimized_debug%': 1,
 
     # Use system protobuf instead of bundled one.
     'use_system_protobuf%': 0,
 
     # Use system yasm instead of bundled one.
     'use_system_yasm%': 0,
 
@@ skipping 933 matching lines @@
       ['enable_resource_whitelist_generation==1 and OS!="win"', {
         'grit_rc_header_format': ['-h', '#define {textual_id} _Pragma("whitelisted_resource_{numeric_id}") {numeric_id}'],
       }],
       ['enable_resource_whitelist_generation==1 and OS=="win"', {
         'grit_rc_header_format': ['-h', '#define {textual_id} __pragma(message("whitelisted_resource_{numeric_id}")) {numeric_id}'],
       }],
       ['enable_mdns==1 or OS=="mac"', {
         'grit_defines': ['-D', 'enable_service_discovery'],
         'enable_service_discovery%': 1
       }],
+      ['use_vulcanize==1', {
+        'grit_defines': ['-D', 'use_vulcanize'],
+      }],
       ['clang_use_chrome_plugins==1', {
         'variables': {
           'conditions': [
             ['OS!="win"', {
               'variables': {
                 'conditions': [
                   ['OS=="mac" or OS=="ios"', {
                     'clang_lib_path%': '<!(cd <(DEPTH) && pwd -P)/third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib',
                   }, { # OS != "mac" or OS != "ios"
                     'clang_lib_path%': '<!(cd <(DEPTH) && pwd -P)/third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.so',
@@ skipping 835 matching lines @@
       }],
       ['video_hole==1', {
         'defines': ['VIDEO_HOLE=1'],
       }],
       ['v8_use_external_startup_data==1', {
        'defines': ['V8_USE_EXTERNAL_STARTUP_DATA'],
       }],
       ['enable_webvr==1', {
         'defines': ['ENABLE_WEBVR'],
       }],
+      ['use_vulcanize==1', {
+        'defines': ['USE_VULCANIZE'],
+      }],
 
       # SAFE_BROWSING_DB_LOCAL - service manages a local database.
       # SAFE_BROWSING_DB_REMOTE - service talks via API to a database
       # SAFE_BROWSING_CSD - enable client-side phishing detection.
       ['safe_browsing==1', {
         'defines': [
           # TODO(nparker): Remove existing uses of FULL_SAFE_BROWSING
           'FULL_SAFE_BROWSING',
           'SAFE_BROWSING_CSD',
           'SAFE_BROWSING_DB_LOCAL',
@@ skipping 3298 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }