Add UMA for PurgeAndSuspend.

third_party/WebKit/public/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("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//tools/grit/grit_rule.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 471 matching lines @@
     "web/WebInputEvent.h",
     "web/WebKit.h",
     "web/WebLabelElement.h",
     "web/WebLeakDetector.h",
     "web/WebLocalFrame.h",
     "web/WebMeaningfulLayout.h",
     "web/WebMediaDeviceChangeObserver.h",
     "web/WebMediaDevicesRequest.h",
     "web/WebMediaPlayerAction.h",
     "web/WebMediaStreamRegistry.h",
+    "web/WebMemoryStatistics.h",
     "web/WebMenuItemInfo.h",
     "web/WebMetaElement.h",
     "web/WebNavigationPolicy.h",
     "web/WebNavigationType.h",
     "web/WebNavigatorContentUtilsClient.h",
     "web/WebNetworkStateNotifier.h",
     "web/WebNode.h",
     "web/WebOptionElement.h",
     "web/WebPagePopup.h",
     "web/WebPepperSocket.h",
@@ skipping 240 matching lines @@
 # relegated to a separate target to avoid duplication between the variants.
 source_set("shared_typemap_traits") {
   visibility = [ ":*" ]
   sources = [
     "web/WindowFeaturesStructTraits.cpp",
   ]
   deps = [
     ":new_wrapper_types_mojo_bindings_shared__generator",
   ]
 }