adding new GM to demostrate new shadows

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 233 matching lines @@
     'skia_fast%': 0,
     'skia_dump_stats%': 0,
     'vulkan_merged_into_skia%': '<(vulkan_merged_into_skia)',
     'skia_fast_flags': [
         '-O3',                   # Even for Debug builds.
         '-march=native',         # Use all features of and optimize for THIS machine.
         '-fomit-frame-pointer',  # Sometimes an extra register is nice, and cuts a push/pop.
         #'-ffast-math',           # Optimize float math even when it breaks IEEE compliance.
         #'-flto'                  # Enable link-time optimization.
     ],
-    'skia_experimental_shadowing': 0,       # for experimental shadow-drawing
+    'skia_experimental_shadowing': 1,       # 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',
   },
 }