Disable Blink assertions on Chromecast device builds

third_party/WebKit/Source/wtf/BUILD.gn

 # Copyright 2014 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("//testing/test.gni")
 
+declare_args() {
+  # Forces assertions to be disabled.
+  disable_wtf_assertions = false
+}
+
 # The list of files is kept in the .gypi.
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("wtf.gypi") ],
                           "scope",
                           [ "wtf.gypi" ])
 
 visibility = [ "//third_party/WebKit/*" ]
 
 config("wtf_config") {
+  defines = []
+
   if (is_win) {
     defines = [

[slan, 2015/12/17 02:44:12]

This needs to be defines += or GN will yell at you on Win builds.

       "__STD_C",
       "_CRT_SECURE_NO_DEPRECATE",
       "_SCL_SECURE_NO_DEPRECATE",
     ]
     include_dirs = [ "os-win32" ]
 
     cflags = [
       # Don't complain about calling specific versions of templatized
       # functions (e.g. in RefPtrHashMap.h).
       "/wd4344",
 
       # dtoa, icu, etc. like doing assignment within conditional.
       "/wd4706",
     ]
 
     if (is_component_build) {
       # Chromium windows multi-dll build enables C++ exceptions and this causes
       # wtf to generate 4291 warning due to operator new/delete
       # implementations. Disable the warning for chromium windows multi-dll
       # build.
       cflags += [ "/wd4291" ]
     }
   }
+
+  if (disable_wtf_assertions) {
+    defines += [ "ENABLE_ASSERT=0" ]

[slan, 2015/12/17 02:44:12]

Any target that has this macro in *.h files should include this as a
public_config. Any target which has this macro in just *.cc files should include
it as a config.

+  }
 }
 
 component("wtf") {
   sources = gypi_values.wtf_files
 
   configs += [
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
 
@@ skipping 92 matching lines @@
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
 
   deps = [
     ":wtf",
   ]
 }