Update from chromium https://crrev.com/304586

gpu/command_buffer/service/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/ui.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 source_set("service") {
   sources = [
     "async_pixel_transfer_delegate.cc",
@@ skipping 26 matching lines @@
     "context_state.h",
     "context_state_autogen.h",
     "context_state_impl_autogen.h",
     "context_state.cc",
     "error_state.cc",
     "error_state.h",
     "feature_info.h",
     "feature_info.cc",
     "framebuffer_manager.h",
     "framebuffer_manager.cc",
+    "gles2_cmd_clear_framebuffer.cc",
+    "gles2_cmd_clear_framebuffer.h",
     "gles2_cmd_copy_texture_chromium.cc",
     "gles2_cmd_copy_texture_chromium.h",
     "gles2_cmd_decoder.h",
     "gles2_cmd_decoder_autogen.h",
     "gles2_cmd_decoder.cc",
     "gles2_cmd_validation.h",
     "gles2_cmd_validation.cc",
     "gles2_cmd_validation_autogen.h",
     "gles2_cmd_validation_implementation_autogen.h",
     "gl_context_virtual.cc",
@@ skipping 98 matching lines @@
   if (is_android && !is_debug) {
     # On Android optimize more since this component can be a bottleneck.
     configs -= [ "//build/config/compiler:optimize" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 }
 
 proto_library("disk_cache_proto") {
   sources = [ "disk_cache_proto.proto" ]
 }