[Tentaive patch for discussion] Add Purge+Suspend metrics as UMA.

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 472 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 221 matching lines @@
   export_define_blink = "BLINK_PLATFORM_IMPLEMENTATION=1"
   export_header_blink = "third_party/WebKit/public/platform/WebCommon.h"
 }
 
 group("generate_mojo_bindings") {
   deps = [
     ":mojo_bindings_blink__generator",
     ":offscreen_canvas_mojo_bindings_blink__generator",
   ]
 }