Adding an It2Me host binary which is uiaccess enabled.

remoting/host/it2me/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/features.gni")
 import("//remoting/remoting_enable.gni")
 import("//remoting/remoting_srcs.gni")
 import("//remoting/remoting_locales.gni")
 import("//remoting/remoting_version.gni")
 
@@ skipping 35 matching lines @@
 
 if (!is_chromeos && !is_android && enable_remoting_host) {
   if (is_win) {
     # GYP version:
     # //remoting/remoting_host_win.gypi:remoting_it2me_native_messaging_host
     executable("remote_assistance_host") {
       configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
       deps = [
         "//base/allocator",
+        "//remoting/host:dpi_aware_exe_manifest",
         "//remoting/host:remoting_core",
         "//remoting/host:remoting_windows_resources",
       ]
 
       sources = [
         "$root_gen_dir/remoting/version.rc",
         "it2me_native_messaging_host_entry_point.cc",
       ]
 
       defines = host_predefines + [ "BINARY=BINARY_REMOTE_ASSISTANCE_HOST" ]
 
       ldflags = [
-        "/MANIFEST:EMBED",
-        "/MANIFESTINPUT:" +
-            rebase_path("../win/common-controls.manifest", root_build_dir),
-        "/MANIFESTINPUT:" +
-            rebase_path("../win/dpi_aware.manifest", root_build_dir),
-
         # "/NODEFAULTLIB", TODO(zijiehe): Why IgnoreAllDefaultLibraries: true in
         # GYP does not take effect?
         "comctl32.lib",
       ]
     }
+
+    # GYP version:
+    # //remoting/remoting_host_win.gypi:remoting_it2me_native_messaging_host_uiaccess
+    executable("remote_assistance_host_uiaccess") {
+      configs += [ "//build/config/compiler:wexit_time_destructors" ]
+
+      deps = [
+        "//base/allocator",
+        "//remoting/host:remoting_core",
+        "//remoting/host:remoting_windows_resources",
+      ]
+
+      sources = [
+        "$root_gen_dir/remoting/version.rc",
+        "it2me_native_messaging_host_entry_point.cc",
+      ]
+
+      defines = host_predefines + [ "BINARY=BINARY_HOST_IT2ME_UIACCESS" ]
+
+      ldflags = [
+        # "/NODEFAULTLIB", TODO(zijiehe): Why IgnoreAllDefaultLibraries: true in
+        # GYP does not take effect?
+        "comctl32.lib",
+      ]
+
+      # uiAccess requires a signed build to work correctly, so only enable the
+      # manifest flag when the binary will be properly signed.
+      if (is_official_build) {

[Jamie, 2016/08/26 00:29:47]

Would it be better to only build this target for an official build? Otherwise
don't you end up with two identical binaries, one of which has a misleading
name?

[joedow, 2016/08/26 18:28:52]

My thought on this was that it is better to build the binary so we can test the
IPC mechanism and using multiple processes w/o requiring a signed build. 
Signing is kind of a pain so we can get a fair amount of benefits for iterative
development and the only downside is that the binary won't actually have
UiAccess.  I think this is worth it (it has been so far for me as I make
changes).

We do something similar for remoting_desktop as well where we only apply the
manifest fragment if it is an official, signed build.

+        deps += [ "//remoting/host:dpi_aware_uiaccess_exe_manifest" ]
+      } else {
+        deps += [ "//remoting/host:dpi_aware_exe_manifest" ]
+      }
+    }
   } else {
     if (is_mac) {
       app_target_type = "mac_app_bundle"
 
       # remote_assistance_host-InfoPlist.strings
       foreach(locale, remoting_locales_with_underscores) {
         bundle_data("remote_assistance_host_strings_${locale}_bundle_data") {
           sources = [
             "$root_gen_dir/remoting/host/remote_assistance_host-InfoPlist.strings/$locale.lproj/InfoPlist.strings",
           ]
@@ skipping 85 matching lines @@
       if (enable_webrtc) {
         deps += [ "//third_party/libjingle:libjingle_webrtc" ]
       }
 
       if (is_desktop_linux) {
         deps += [ "//build/config/linux/gtk2" ]
       }
     }
   }
 }