Fix angle build on Ubuntu

gyp/common_variables.gypi

 # Copyright 2012 The Android Open Source Project
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   # Get ready for the ugly...
   #
   # - We have to nest our variables dictionaries multiple levels deep, so that
   #   this and other gyp files can rely on previously-set variable values in
@@ skipping 187 matching lines @@
 
     # Re-define all variables defined within the level-2 'variables' dict,
     # so that siblings of the level-1 'variables' dict can see them.
     'arm_version%': '<(arm_version)',
     'arm_neon%': '<(arm_neon)',
     'mips_arch_variant%': 'mips32',
     'mips_dsp%': 0,
     'skia_os%': '<(skia_os)',
     'os_posix%': '<(os_posix)',
 
+    'pkg-config%': 'pkg-config',
+
     'skia_freetype_static%': '<(skia_freetype_static)',
     'skia_no_fontconfig%': '<(skia_no_fontconfig)',
     'skia_embedded_fonts%': '<(skia_embedded_fonts)',
     'skia_sanitizer%': '<(skia_sanitizer)',
     'skia_sanitizer_blacklist%':
       '<!(python -c "import sys; import os; print os.path.abspath(sys.argv[1])" ../tools/xsan.blacklist)',
     'skia_mesa%': '<(skia_mesa)',
     'skia_gpu_extra_dependency_path%': '<(skia_gpu_extra_dependency_path)',
     'skia_gpu_extra_tests_path%': '<(skia_gpu_extra_tests_path)',
     'skia_stroke_path_rendering%': '<(skia_stroke_path_rendering)',
@@ skipping 38 matching lines @@
         #'-flto'                  # Enable link-time optimization.
     ],
     'skia_experimental_shadowing': 0,       # for experimental shadow-drawing
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }