Add extra warnings to match what Android uses.

gyp/common_conditions.gypi

Index: gyp/common_conditions.gypi
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index 770269f2b6fbff9e8ed90b185a03ef3692cb08ac..917298f914fcbf810263e3685d0a99bba9c13bca 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -149,6 +149,22 @@
     # 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': [
@@ -229,13 +245,6 @@
             'defines': [ 'NDEBUG' ],
           },
         },
-        'cflags': [
-          '-Wall',
-          '-Wextra',
-          # suppressions below here were added for clang
-          '-Wno-unused-parameter',
-          '-Wno-c++11-extensions',
-        ],
         'conditions' : [
           [ 'skia_shared_lib', {
             'cflags': [
@@ -474,14 +483,8 @@
           '-llog',
         ],
         'cflags': [
-          '-Wall',
-          '-fno-exceptions',
-          '-fstrict-aliasing',
           '-fuse-ld=gold',
         ],
-        'cflags_cc': [
-          '-fno-rtti',
-        ],
         'conditions': [
           [ 'skia_shared_lib', {
             'cflags': [