Add ppapi, improve Windows GN build.

base/allocator/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/allocator.gni")
 
 # Only executables and not libraries should depend on the allocator target;
 # only the application (the final executable) knows what allocator makes sense.
 # This "allocator" meta-target will forward to the default allocator according
 # to the build settings.
@@ skipping 160 matching lines @@
         "$tcmalloc_dir/src/base/thread_lister.c",
         "$tcmalloc_dir/src/base/thread_lister.h",
         "$tcmalloc_dir/src/profiledata.cc",
         "$tcmalloc_dir/src/profiledata.h",
         "$tcmalloc_dir/src/profile-handler.cc",
         "$tcmalloc_dir/src/profile-handler.h",
         "$tcmalloc_dir/src/profiler.cc",
       ]
       defines += [ "PERFTOOLS_DLL_DECL=" ]
 
+      configs -= [
+        # Tcmalloc defines this itself, and we don't want duplicate definition
+        # warnings.
+        "//build/config/win:nominmax",
+      ]
+
       direct_dependent_configs = [ ":nocmt" ]
 
       deps += [
         ":prep_libc",
       ]
     }
 
     if (is_linux || is_android) {
       sources -= [
         "$tcmalloc_dir/src/system-alloc.h",
@@ skipping 42 matching lines @@
   }
 }  # !is_android
 
 source_set("allocator_extension_thunks") {
   visibility = "//base/*"
   sources = [
     "allocator_extension_thunks.cc",
     "allocator_extension_thunks.h",
   ]
 }