Add extra warnings to match what Android uses.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
         'defines': [
@@ skipping 131 matching lines @@
               },
             },
           }],
         ],
       },
     ],
 
     # The following section is common to linux + derivatives and android
     [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl", "chromeos", "android"]',
       {
+        'cflags': [
+          '-fno-exceptions',
+          '-fstrict-aliasing',
+        
+          '-Wall',
+          '-Wextra',
+          '-Winit-self',
+          '-Wpointer-arith',
+
+          '-Wno-unused-parameter',
+          '-Wno-c++11-extensions',
+        ],
+        'cflags_cc': [
+          '-fno-rtti',
+          '-Wnon-virtual-dtor',
+        ],
         'conditions': [
           [ 'skia_warnings_as_errors', {
             'cflags': [
               '-Werror',
             ],
           }],
           [ 'skia_arch_type == "arm" and arm_thumb == 1', {
             'cflags': [
               '-mthumb',
             ],
@@ skipping 60 matching lines @@
             'cflags': ['-g']
           },
           'Release': {
             'cflags': [
               '-O<(skia_release_optimization_level)',
               '-g',
             ],
             'defines': [ 'NDEBUG' ],
           },
         },
-        'cflags': [
-          '-Wall',
-          '-Wextra',
-          # suppressions below here were added for clang
-          '-Wno-unused-parameter',
-          '-Wno-c++11-extensions',
-        ],
         'conditions' : [
           [ 'skia_shared_lib', {
             'cflags': [
               '-fPIC',
             ],
             'defines': [
               'SKIA_DLL',
               'SKIA_IMPLEMENTATION=1',
             ],
           }],
@@ skipping 218 matching lines @@
             'cflags': ['-O2'],
             'defines': [ 'NDEBUG' ],
           },
         },
         'libraries': [
           '-lstdc++',
           '-lm',
           '-llog',
         ],
         'cflags': [
-          '-Wall',
-          '-fno-exceptions',
-          '-fstrict-aliasing',
           '-fuse-ld=gold',
         ],
-        'cflags_cc': [
-          '-fno-rtti',
-        ],
         'conditions': [
           [ 'skia_shared_lib', {
             'cflags': [
               '-fPIC',
             ],
             'defines': [
               'SKIA_DLL',
               'SKIA_IMPLEMENTATION=1',
             ],
           }],
@@ skipping 16 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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