reland crrev.com/212927 Move webkitplatformsupport_impl and related from glue to child

webkit/child/webkit_child_helpers.cc

Index: webkit/child/webkit_child_helpers.cc
diff --git a/webkit/child/webkit_child_helpers.cc b/webkit/child/webkit_child_helpers.cc
new file mode 100644
index 0000000000000000000000000000000000000000..67779550dde64c32cac1e18b8fb06d929d34eed1
--- /dev/null
+++ b/webkit/child/webkit_child_helpers.cc
@@ -0,0 +1,53 @@
+// Copyright (c) 2013 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.
+
+#include "webkit/child/webkit_child_helpers.h"
+
+#if defined(OS_LINUX)
+#include <malloc.h>
+#endif
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/process_util.h"
+#include "v8/include/v8.h"
+
+namespace webkit_glue {
+
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+size_t MemoryUsageKB() {
+  struct mallinfo minfo = mallinfo();
+  uint64_t mem_usage =
+#if defined(USE_TCMALLOC)
+      minfo.uordblks
+#else
+      (minfo.hblkhd + minfo.arena)
+#endif
+      >> 10;
+
+  v8::HeapStatistics stat;
+  // TODO(svenpanne) The call below doesn't take web workers into account, this
+  // has to be done manually by iterating over all Isolates involved.
+  v8::Isolate::GetCurrent()->GetHeapStatistics(&stat);
+  return mem_usage + (static_cast<uint64_t>(stat.total_heap_size()) >> 10);
+}
+#elif defined(OS_MACOSX)
+size_t MemoryUsageKB() {
+  scoped_ptr<base::ProcessMetrics> process_metrics(
+      // The default port provider is sufficient to get data for the current
+      // process.
+      base::ProcessMetrics::CreateProcessMetrics(
+          base::GetCurrentProcessHandle(), NULL));
+  return process_metrics->GetWorkingSetSize() >> 10;
+}
+#else
+size_t MemoryUsageKB() {
+  scoped_ptr<base::ProcessMetrics> process_metrics(
+      base::ProcessMetrics::CreateProcessMetrics(
+          base::GetCurrentProcessHandle()));
+  return process_metrics->GetPagefileUsage() >> 10;
+}
+#endif
+
+}  // webkit_glue