GN: Add -Wl,-z defs on linux and fix errors

ui/keyboard/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("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/google_input_tools/closure.gni")
 import("//third_party/google_input_tools/inputview.gni")
 import("//tools/grit/grit_rule.gni")
 
 component("keyboard") {
@@ skipping 27 matching lines @@
     ":resources",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//content/public/browser",
     "//content/public/common",
     "//mojo/edk/js",
     "//mojo/edk/system",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
+    "//skia",

[Nico, 2015/01/15 23:35:07]

What's this for? 

[jamesr, 2015/01/16 02:00:45]

https://code.google.com/p/chromium/codesearch#chromium/src/ui/keyboard/keyboa...

this does manipulations with SkRect and SkPath

(this file should IWYU and #include the SkRect/SkPath headers, but that's kind
of outside scope)

     "//url",
     "//ui/aura",
     "//ui/base",
     "//ui/compositor",
     "//ui/events",
     "//ui/events:dom4_keycode_converter",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/wm",
   ]
@@ skipping 74 matching lines @@
     "//ui/compositor:test_support",
     "//ui/events:test_support",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/resources:ui_test_pak",
     "//ui/wm",
     "//url",
   ]
 }