Build third-party code with -Wall, build chromium_code with -Wextra on Linux

third_party/android_protobuf/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (current_toolchain == host_toolchain) {
   # GYP: //third_party/android_protobuf/android_protobuf.gyp:android_protoc
   executable("android_protoc") {
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
 
@@ skipping 100 matching lines @@
 
     include_dirs = [
       "src/android",
       "src/src",
     ]
 
     if (is_clang) {
       cflags = [
         "-Wno-null-conversion",
         "-Wno-tautological-undefined-compare",
+        "-Wno-unused-function",
+        "-Wno-unused-local-typedef",
       ]
     }
     defines = [
       # This macro must be defined to suppress the use
       # of dynamic_cast<>, which requires RTTI.
       "GOOGLE_PROTOBUF_NO_RTTI",
       "GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER",
     ]
   }
 }
@@ skipping 12 matching lines @@
       "src/java/src/main/java/com/google/protobuf/nano/FieldData.java",
       "src/java/src/main/java/com/google/protobuf/nano/InternalNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java",
       "src/java/src/main/java/com/google/protobuf/nano/MessageNano.java",
       "src/java/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java",
       "src/java/src/main/java/com/google/protobuf/nano/UnknownFieldData.java",
       "src/java/src/main/java/com/google/protobuf/nano/WireFormatNano.java",
     ]
   }
 }