skia: Add support for ANGLE on linux

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 71 matching lines @@
           'skia_os%': '<(skia_os)',
           'skia_chrome_utils%': 1,
           'skia_use_android_framework_defines%': 0,
           'skia_use_system_json%': 0,
         }],
         [ 'skia_os == "win"', {
           'os_posix%': 0,
         }, {
           'os_posix%': 1,
         }],
+        [ 'skia_os == "linux"', {
+          # ANGLE on linux require these two variable be defined.
+          'chromeos%': 0,
+          'use_x11%': 1,
+        }],
         [ 'skia_os == "android"', {
           'skia_static_initializers%': 0,
           'skia_egl%': 1,
         }, {
           'skia_static_initializers%': 1,
         }],
         [ 'skia_os == "ios"', {
           'skia_arch_type%': 'arm',
           'arm_version%': 7,
           'arm_neon%': 0, # neon asm files known not to work with the ios build
@@ skipping 55 matching lines @@
 
       # This variable allows the user to customize the optimization level used
       # by the compiler.  The user should be aware that this has different
       # meanings for different compilers and should exercise caution when
       # overriding it.
       [ 'skia_os == "win"', {
         'skia_release_optimization_level%': '<(skia_default_vs_optimization_level)',
       }, {
         'skia_release_optimization_level%': '<(skia_default_gcc_optimization_level)',
       }],
+      [ 'skia_os == "linux"', {
+        # ANGLE on linux require these two variable be defined.
+        'chromeos%': 0,
+        'use_x11%': 1,
+      }],
       [ 'skia_sanitizer', {
         'skia_clang_build': 1,
         'skia_keep_frame_pointer': 1,
       }, {
         'skia_clang_build%': 0,
         'skia_keep_frame_pointer%': 0,
       }],
-      [ 'skia_shared_lib or skia_sanitizer or skia_os == "android"', {
+      [ 'skia_shared_lib or skia_sanitizer or skia_os == "android" or (skia_os == "linux" and skia_angle == 1)', {
           'skia_pic%' : 1,
         }, {
           'skia_pic%' : 0,
         }
       ],
     ],
 
     # 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)',
@@ skipping 50 matching lines @@
         '-ffast-math',           # Optimize float math even when it breaks IEEE compliance.
         #'-flto'                  # Enable link-time optimization.
     ],
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }