MD Downloads: add a use_vulcanize option to Chrome

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 0974b49752e64eb3aaa4cd9c89bc79f6fbaeb110..9ba4bcc498ca319264969bc0c7287f0176e21f81 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -712,6 +712,10 @@
       # 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"', {
@@ -1251,6 +1255,7 @@
     '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,
@@ -2204,6 +2209,9 @@
         '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': [
@@ -3059,6 +3067,9 @@
       ['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