Remove wtf/process_metrics.h.

Whitelist the one place which wants to query malloc usage, which is a
memory reduction histogram on Android.

Change-Id: I03a821aeec7b3b0524b02b432d2cea196b7a1f83
Reviewed-on: https://chromium-review.googlesource.com/1117634Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571098}

third_party/blink/renderer/bindings/DEPS

 include_rules = [
     "+base/memory/scoped_refptr.h",
+    "+base/process/process_metrics.h",
     "+gin/public",
     "+services/network/public/mojom/fetch_api.mojom-blink.h",
     "+third_party/blink/renderer/bindings",

third_party/blink/renderer/bindings/core/v8/v8_gc_for_context_dispose.cc

@@ -30,27 +30,31 @@
 
 #include "third_party/blink/renderer/bindings/core/v8/v8_gc_for_context_dispose.h"
 
+#include "base/process/process_metrics.h"
 #include "build/build_config.h"
 #include "third_party/blink/public/platform/platform.h"
 #include "third_party/blink/renderer/platform/bindings/v8_per_isolate_data.h"
 #include "third_party/blink/renderer/platform/histogram.h"
 #include "third_party/blink/renderer/platform/memory_coordinator.h"
 #include "third_party/blink/renderer/platform/scheduler/public/thread_scheduler.h"
-#include "third_party/blink/renderer/platform/wtf/process_metrics.h"
 #include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
 #include "third_party/blink/renderer/platform/wtf/time.h"
 #include "v8/include/v8.h"
 
-size_t GetMemoryUsage() {
-  size_t usage = WTF::GetMallocUsage() + WTF::Partitions::TotalActiveBytes() +
-                 blink::ProcessHeap::TotalAllocatedObjectSize() +
-                 blink::ProcessHeap::TotalMarkedObjectSize();
+#if defined(OS_ANDROID)
+static size_t GetMemoryUsage() {
+  size_t usage =
+      base::ProcessMetrics::CreateCurrentProcessMetrics()->GetMallocUsage() +
+      WTF::Partitions::TotalActiveBytes() +
+      blink::ProcessHeap::TotalAllocatedObjectSize() +
+      blink::ProcessHeap::TotalMarkedObjectSize();
   v8::HeapStatistics v8_heap_statistics;
   blink::V8PerIsolateData::MainThreadIsolate()->GetHeapStatistics(
       &v8_heap_statistics);
   usage = v8_heap_statistics.total_heap_size();
   return usage;
 }
+#endif  // defined(OS_ANDROID)
 
 namespace blink {
 

third_party/blink/renderer/platform/wtf/BUILD.gn

@@ -112,7 +112,6 @@ jumbo_component("wtf") {
     "math_extras.h",
     "noncopyable.h",
     "not_found.h",
-    "process_metrics.h",
     "ref_counted.h",
     "ref_vector.h",
     "retain_ptr.h",

third_party/blink/renderer/platform/wtf/process_metrics.h

-// Copyright (c) 2017 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.
-
-#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_PROCESS_METRICS_H_
-#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_PROCESS_METRICS_H_
-
-#include "base/process/process_metrics.h"
-
-namespace WTF {
-
-size_t GetMallocUsage() {
-  std::unique_ptr<base::ProcessMetrics> metric(
-      base::ProcessMetrics::CreateCurrentProcessMetrics());
-  return metric->GetMallocUsage();
-}
-
-}  // namespace WTF
-
-#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_PROCESS_METRICS_H_

third_party/blink/tools/audit_non_blink_usage.py

@@ -236,6 +236,13 @@ _CONFIG = [
         'paths': ['third_party/blink/renderer/bindings/'],
         'allowed': ['gin::.+'],
     },
+    {
+        'paths': ['third_party/blink/renderer/bindings/core/v8/v8_gc_for_context_dispose.cc'],
+        'allowed': [
+            # For memory reduction histogram.
+            'base::ProcessMetrics',
+        ],
+    },
     {
         'paths': ['third_party/blink/renderer/core/clipboard'],
         'allowed': ['gfx::PNGCodec'],