Revert "Remove yasm (and DONT_EMBED_BUILD_METADATA)."

build/config/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/allocator.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 
 declare_args() {
   # When set, turns off the (normally-on) iterator debugging and related stuff
   # that is normally turned on for Debug builds. These are generally useful for
   # catching bugs but in some cases may cause conflicts or excessive slowness.
   disable_iterator_debugging = false
 
+  # Set to true to not store any build metadata, e.g. ifdef out all __DATE__
+  # and __TIME__. Set to 0 to reenable the use of these macros in the code
+  # base. See http://crbug.com/314403.
+  #
+  # Continue to embed build meta data in Official builds, basically the
+  # time it was built.
+  # TODO(maruel): This decision should be revisited because having an
+  # official deterministic build has high value too but MSVC toolset can't
+  # generate anything deterministic with WPO enabled AFAIK.
+  dont_embed_build_metadata = !is_official_build
+
   # Set to true to enable dcheck in Release builds.
   dcheck_always_on = false
 
   # Set to true to compile with the OpenGL ES 2.0 conformance tests.
   internal_gles2_conform_tests = false
 }
 
 # TODO(brettw) Most of these should be removed. Instead of global feature
 # flags, we should have more modular flags that apply only to a target and its
 # dependents. For example, depending on the "x11" meta-target should define
 # USE_X11 for all dependents so that everything that could use X11 gets the
 # define, but anything that doesn't depend on X11 doesn't see it.
 #
 # For now we define these globally to match the current GYP build.
 config("feature_flags") {
   # TODO(brettw) this probably needs to be parameterized.
   defines = [ "V8_DEPRECATION_WARNINGS" ]  # Don't use deprecated V8 APIs anywhere.
 
+  if (dont_embed_build_metadata) {
+    defines += [ "DONT_EMBED_BUILD_METADATA" ]
+  }
   if (dcheck_always_on) {
     defines += [ "DCHECK_ALWAYS_ON=1" ]
   }
   if (use_udev) {
     # TODO(brettw) should probably be "=1".
     defines += [ "USE_UDEV" ]
   }
   if (use_ozone) {
     defines += [ "USE_OZONE=1" ]
   }
@@ skipping 111 matching lines @@
       "CoreFoundation.framework",
       "CoreGraphics.framework",
       "CoreText.framework",
       "Foundation.framework",
       "UIKit.framework",
     ]
   } else if (is_linux) {
     libs = [ "dl" ]
   }
 }