Start work on adding content/browser to GN build.

This is not yet hooked up.

Adds power_gadget build file.

Removes blink headers stub config now that the real target exists.

TBR=scottmg

Review URL: https://codereview.chromium.org/300383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273594 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/browser.gni b/content/browser/browser.gni
new file mode 100644
index 0000000..b7e8d7f
--- /dev/null
+++ b/content/browser/browser.gni
@@ -0,0 +1,15 @@
+# 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.
+
+# This file defines the content browser gypi values. This file is read once and
+# cached, which is a performance optimization that allows us to share the
+# results of parsing the .gypi file between the public and private BUILD.gn
+# files. It also saves us from duplicating this exec_script call.
+content_browser_gypi_values = exec_script(
+    "//build/gypi_to_gn.py",
+    [ rebase_path("../content_browser.gypi"),
+      "--replace=<(SHARED_INTERMEDIATE_DIR)=$root_gen_dir" ],
+    "scope",
+    [ "../content_browser.gypi" ])
+