Separate desktop and mobile media player controls image resources.

third_party/WebKit/public/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("//third_party/WebKit/Source/config.gni")
 import("//tools/grit/grit_rule.gni")
 
 blink_headers_values = exec_script("//build/gypi_to_gn.py",
                                    [ rebase_path("blink_headers.gypi") ],
                                    "scope",
@@ skipping 144 matching lines @@
       "-D",
       "use_concatenated_impulse_responses",
     ]
   }
 }
 
 # GYP version: WebKit/public/blink_resources.gyp:blink_image_resources
 grit("image_resources") {
   output_dir = "$root_gen_dir/blink/public/resources"
   use_qualified_include = true
+  if (is_android) {
+    platform_type = "mobile"
+  } else {
+    platform_type = "desktop"
+  }
   source = "blink_image_resources.grd"
   outputs = [
     "grit/blink_image_resources.h",
     "blink_image_resources_100_percent.pak",
     "blink_image_resources_200_percent.pak",
   ]
+  grit_flags = [
+    "-E",
+    "platform_type=" + platform_type,
+  ]
 }