Added warning for variable-length arrays to GYP

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 226 matching lines @@
         'cflags': [
           '-g',
           '-fno-exceptions',
           '-fstrict-aliasing',
 
           '-Wall',
           '-Wextra',
           '-Winit-self',
           '-Wpointer-arith',
           '-Wsign-compare',
+          '-Wvla',
 
           '-Wno-unused-parameter',
         ],
         'cflags_cc': [
           '-std=c++11',
           '-fno-rtti',
           '-fno-threadsafe-statics',
           '-Wnon-virtual-dtor',
         ],
         'ldflags': [ '-rdynamic' ],
@@ skipping 297 matching lines @@
           'GCC_SYMBOLS_PRIVATE_EXTERN':                'YES',  # -fvisibility=hidden
           'GCC_INLINES_ARE_PRIVATE_EXTERN':            'YES',  # -fvisibility-inlines-hidden
           'GCC_CW_ASM_SYNTAX':                         'NO',   # remove -fasm-blocks
           'GCC_ENABLE_PASCAL_STRINGS':                 'NO',   # remove -mpascal-strings
           'WARNING_CFLAGS': [
             '-Wall',
             '-Wextra',
             '-Winit-self',
             '-Wpointer-arith',
             '-Wsign-compare',
+            '-Wvla',
 
             '-Wno-unused-parameter',
           ],
         },
       },
     ],
 
     [ 'skia_os == "ios"',
       {
         'defines': [
@@ skipping 129 matching lines @@
           'LD_RUNPATH_SEARCH_PATHS': ['@executable_path/.'],
       },
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }