enable fp16 when --enable-hdr-output is on

media/gpu/BUILD.gn

 # Copyright 2016 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/features.gni")
 import("//build/config/ui.gni")
 import("//media/gpu/args.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
@@ skipping 128 matching lines @@
     "shared_memory_region.h",
   ]
 
   public_deps = [
     "//base",
     "//gpu",
     "//media",
     "//ui/gfx/geometry",
   ]
   deps = [
+    "//ui/base",
     "//ui/display/types",
     "//ui/gl",
     "//ui/platform_window",
   ]
   libs = []
   ldflags = []
 
   configs += [ ":gpu_config" ]
 
   if (is_mac) {
@@ skipping 368 matching lines @@
     "//base/test:test_support",
     "//gpu:test_support",
     "//media/gpu/ipc/common",
     "//media/gpu/ipc/service",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
   ]
 }