Default SK_ANGLE to true on Windows, run angle whenever possible on bots.

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 65 matching lines @@
           'skia_os%': 'android',
           'skia_chrome_utils%': 0,
           'skia_use_system_json%': 1,
         }, {
           'skia_os%': '<(skia_os)',
           'skia_chrome_utils%': 1,
           'skia_use_system_json%': 0,
         }],
         [ 'skia_os == "win"', {
           'os_posix%': 0,
+          'skia_angle%': 1,
         }, {
           'os_posix%': 1,
+          'skia_angle%': 0,
         }],
         [ 'skia_os in ["linux"]', {
           'skia_poppler_enabled%': 1,
         }, {
           'skia_poppler_enabled%': 0,
         }],
         ['"64" in skia_arch_type', {
           'skia_arch_width%': 64,
         }, {
           'skia_arch_width%': 32,
@@ skipping 42 matching lines @@
       #     version instead.
       'skia_no_fontconfig%': '0',
 
       'skia_sanitizer%': '',
       'skia_scalar%': 'float',
       'skia_mesa%': 0,
       'skia_stroke_path_rendering%': 0,
       'skia_android_path_rendering%': 0,
       'skia_resource_cache_mb_limit%': 0,
       'skia_resource_cache_count_limit%': 0,
-      'skia_angle%': 0,
       'skia_gdi%': 0,
       'skia_gpu%': 1,
       'skia_osx_deployment_target%': '',
       'skia_profile_enabled%': 0,
       'skia_win_debuggers_path%': '',
       'skia_shared_lib%': 0,
       'skia_opencl%': 0,
       'skia_force_distance_field_text%': 0,
 
       # These variables determine the default optimization level for different
@@ skipping 79 matching lines @@
     'skia_moz2d%': 0,
     'skia_is_bot%': '<!(python -c "import os; print os.environ.get(\'CHROME_HEADLESS\', 0)")',
     'skia_egl%': '<(skia_egl)',
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }