Fix Windows build warning LNK4217 for blink_platform.dll.

cc/ipc/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/ui.gni")
 import("//cc/cc.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 cc_component("ipc") {
   output_name = "cc_ipc"
@@ skipping 48 matching lines @@
   ]
 
   public_deps = [
     "//gpu/ipc/common:interfaces",
     "//mojo/common:common_custom_types",
     "//skia/public/interfaces",
     "//ui/events/mojo:interfaces",
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
   ]
+
+  export_class_attribute_blink = "BLINK_PLATFORM_EXPORT"

[jam, 2016/12/14 17:53:39]

I don't understand this change and the next file.

Why isn't coe in cc/ using CC_EXPORT?

+  export_define_blink = "BLINK_PLATFORM_IMPLEMENTATION=1"
+  export_header_blink = "third_party/WebKit/public/platform/WebCommon.h"
 }
 
 # Interfaces between two privileged services.
 mojom("internal_interfaces") {
   sources = [
     "display_compositor.mojom",
   ]
 
   public_deps = [
     ":interfaces",
@@ skipping 45 matching lines @@
     "//mojo/common:struct_traits",
     "//skia/public/interfaces:struct_traits",
     "//ui/events:events_base",
     "//ui/events/mojo:struct_traits",
     "//ui/gfx",
     "//ui/gfx:selection_bound",
     "//ui/gfx/geometry/mojo:struct_traits",
     "//ui/gfx/mojo:struct_traits",
   ]
 }