Add the Windows.IsPinnedToTaskbar metric.

chrome/common/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/buildflag_header.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
 
@@ skipping 408 matching lines @@
   deps = [
     ":constants",
     "//base",
   ]
 }
 
 mojom("mojo_bindings") {
   sources = [
     "image_decoder.mojom",
     "resource_usage_reporter.mojom",
+    "shell_handler_win.mojom",
   ]
 
   public_deps = [
     "//skia/public/interfaces",
   ]
 }