content: Make record_whole_document available for all platforms.

content/public/common/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("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//content/common/common.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/webrtc/build/webrtc.gni")
@@ skipping 53 matching lines @@
     "content_switches.h",
   ]
   sources = [
     "//content/common/content_export.h",
     "content_switches.cc",
   ]
 
   public_configs = [ ":static_switches_defines" ]
 }
 
+# Set only in GN builds, to allow enabling of WebPreferences used on the Blimp
+# engine.
+config("blimp_web_prefs") {
+  if (enable_blimp_web_prefs) {
+    defines = [ "ENABLE_BLIMP_WEB_PREFS" ]

[Wez, 2016/03/22 00:18:14]

Could we instead have this be enable_record_whole_document or something? Seems
strange to bake any understanding of Blimp in at this level.

[Khushal, 2016/03/22 00:21:38]

I assume we would need to add more web prefs for Blimp going forward, for
instance to disable custom fonts. So might be better to put all such changes for
web prefs behind a single flag.

+  }
+}
+
 source_set("common_sources") {
   visibility = [ "//content/*" ]
 
   sources = rebase_path(content_common_gypi_values.public_common_sources,
                         ".",
                         "//content")
 
   configs += [
     "//build/config:precompiled_headers",
     "//content:content_implementation",
   ]
 
   public_configs = [ "//v8:external_startup_data" ]
 
   public_deps = [
     "//content/common",
     "//mojo/public/cpp/bindings",
     "//url/ipc:url_ipc",
   ]
   deps = [
     "//net",
     "//skia",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/icu",
     "//ui/base",
     "//ui/gfx",
   ]
+  all_dependent_configs = [ ":blimp_web_prefs" ]
 
   if (!enable_plugins) {
     sources -= [
       "pepper_plugin_info.cc",
       "pepper_plugin_info.h",
     ]
   }
 
   if (enable_webrtc) {
     sources += [
@@ skipping 20 matching lines @@
 
 source_set("feature_h264_with_openh264_ffmpeg") {
   deps = [
     ":features",
   ]
   sources = [
     "feature_h264_with_openh264_ffmpeg.cc",
     "feature_h264_with_openh264_ffmpeg.h",
   ]
 }