Reland of Make ui/gl/... consistently use on Swiftshader includes on Windows official builds.

ui/gl/init/BUILD.gn

Index: ui/gl/init/BUILD.gn
diff --git a/ui/gl/init/BUILD.gn b/ui/gl/init/BUILD.gn
index baec674031088729bae8e37946b7023683546664..55bb9c7782592bf22b267d54c65c67d82b42251b 100644
--- a/ui/gl/init/BUILD.gn
+++ b/ui/gl/init/BUILD.gn
@@ -17,8 +17,6 @@
     "gl_initializer.h",
   ]
   defines = [ "GL_INIT_IMPLEMENTATION" ]
-
-  include_dirs = [ "//third_party/swiftshader/include" ]
 
   deps = [
     "//base",
@@ -42,6 +40,10 @@
 
     libs = [ "dwmapi.lib" ]
     ldflags = [ "/DELAYLOAD:dwmapi.dll" ]
+
+    if (is_official_build) {
+      include_dirs = [ "//third_party/swiftshader/include" ]
+    }
   } else if (is_mac) {
     sources += [
       "gl_factory_mac.cc",