Add a go-fast button to Skia GYP configs.

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 221 matching lines @@
     'skia_opencl%': '<(skia_opencl)',
     'skia_force_distance_field_text%': '<(skia_force_distance_field_text)',
     'skia_static_initializers%': '<(skia_static_initializers)',
     'ios_sdk_version%': '6.0',
     'skia_win_debuggers_path%': '<(skia_win_debuggers_path)',
     'skia_run_pdfviewer_in_gm%': 0,
     'skia_disable_inlining%': 0,
     'skia_moz2d%': 0,
     'skia_is_bot%': '<!(python -c "import os; print os.environ.get(\'CHROME_HEADLESS\', 0)")',
     'skia_egl%': '<(skia_egl)',
+    'skia_fast%': 0,
+    '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.
+    ],
 
     # These are referenced by our .gypi files that list files (e.g. core.gypi)
     #
     'skia_src_path%': '../src',
     'skia_include_path%': '../include',
   },
 }