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

third_party/WebKit/Source/web/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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 182 matching lines @@
     "WebInputEventConversion.cpp",
     "WebInputEventConversion.h",
     "WebKit.cpp",
     "WebLabelElement.cpp",
     "WebLeakDetector.cpp",
     "WebLocalFrameImpl.cpp",
     "WebLocalFrameImpl.h",
     "WebMediaDeviceChangeObserver.cpp",
     "WebMediaDevicesRequest.cpp",
     "WebMediaStreamRegistry.cpp",
+    "WebMemoryStatistics.cpp",
     "WebMetaElement.cpp",
     "WebNetworkStateNotifier.cpp",
     "WebNode.cpp",
     "WebOptionElement.cpp",
     "WebPageImportanceSignals.cpp",
     "WebPagePopupImpl.cpp",
     "WebPagePopupImpl.h",
     "WebPepperSocket.cpp",
     "WebPepperSocketChannelClientProxy.h",
     "WebPepperSocketImpl.cpp",
@@ skipping 208 matching lines @@
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }