GN: Make content_shell and webkit_unit_tests work in component build

content/public/browser/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("//content/browser/browser.gni")
 import("//build/config/ui.gni")
 
-source_set("browser") {
+group("browser") {

[jamesr, 2014/08/12 04:03:08]

without this patch various components were depending on //content/public/browser
in the component build and linking in pieces of content into themselves, which
doesn't work very well.

//content/public/{common,renderer,etc} have the same issue at least in theory
but converting them all over to this without introducing cycles through
//content or adding conditionals to a really crazy number of things conditional
on is_component_build. for now this is the only target producing failing links
so it's all i've done for now

+  if (is_component_build) {
+    deps = [ "//content" ]
+  } else {
+    deps = [ ":sources" ]
+  }
+  forward_dependent_configs_from = deps
+}
+
+source_set("sources") {
+  visibility = [ "//content", ":browser" ]
+
   if (is_ios) {
     # iOS doesn't get the normal file list and only takes these whitelisted
     # files.
     sources = [
       "browser_main_parts.cc",
       "content_browser_client.cc",
       "favicon_status.cc",
       "navigation_details.cc",
       "notification_registrar.cc",
       "page_navigator.cc",
@@ skipping 11 matching lines @@
   configs += [ "//content:content_implementation" ]
 
   deps = [
     "//content/browser",
     "//skia",
   ]
 
   # We expose skia headers in the public API.
   forward_dependent_configs_from = [ "//skia" ]
 }