Only generate GPU json data entries related to a given platform at build time.

gpu/config/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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
 
 group("config") {
   if (is_component_build) {
@@ skipping 37 matching lines @@
     "gpu_feature_type.h",
     "software_rendering_list.json",
   ]
 
   outputs = process_json_outputs
 
   args = [
     "--output-dir",
     rebase_path("$target_gen_dir", root_build_dir),
     "--skip-testing-data",
+    "--os-filter",
   ]
+  if (is_win) {
+    args += [ "win" ]
+  } else if (is_mac) {
+    args += [ "macosx" ]
+  } else if (is_android) {
+    args += [ "android" ]
+  } else if (is_chromeos) {
+    args += [ "chromeos" ]
+  } else {
+    args += [ "linux" ]
+  }
 }
 
 source_set("config_sources") {
   # External code should depend on this via //gpu/config above rather than
   # depending on this directly or the component build will break.
   visibility = [ "//gpu/*" ]
 
   sources = [
     "dx_diag_node.cc",
     "dx_diag_node.h",
@@ skipping 60 matching lines @@
       sources += [
         "//third_party/amd/AmdCfxPxExt.h",
         "//third_party/amd/amd_videocard_info_win.cc",
       ]
     }
   }
   if (is_linux || is_mac) {
     deps += [ "//third_party/angle:angle_gpu_info_util" ]
   }
 }