Android WebView: support building against system skia.

skia/skia_system.gypi

Index: skia/skia_system.gypi
diff --git a/skia/skia_system.gypi b/skia/skia_system.gypi
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index 0000000000000000000000000000000000000000..b05623c0500b1d69faf319ca4c7492cc03fa1118
--- /dev/null
+++ b/skia/skia_system.gypi
@@ -0,0 +1,24 @@
+# Copyright 2013 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 gypi file contains the shim header generation and other settings to use
+# the system version of skia on Android.
+{
+  'direct_dependent_settings': {
+    # This makes the Android build system set the include path appropriately.
+    'libraries': [ '-lskia' ],
+  },
+  'link_settings': {
+    # This actually causes the final binary to be linked against skia.
+    'libraries': [ '-lskia' ],
+  },
+  'variables': {
+    'headers_root_path': '../third_party/skia/include',
+  },
+  'includes': [
+    '../third_party/skia/gyp/public_headers.gypi',
+    '../build/shim_headers.gypi',
+  ],
+}