Move malloc/partition_alloc memory usage functions to base

third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp

Index: third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp
diff --git a/third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp b/third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp
index 465a85aba5907abe67efdb2c34a8c0513404c994..d564e83eb6d2fd82cc9cdb9d6fbc06818f0e8cd3 100644
--- a/third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp
+++ b/third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp
@@ -5,40 +5,15 @@
 #include "public/web/WebMemoryStatistics.h"
 
 #include "platform/heap/Handle.h"
-#include "platform/wtf/allocator/Partitions.h"
+#include "platform/wtf/ProcessMetrics.h"
 
 namespace blink {
 
-namespace {
-
-class LightPartitionStatsDumperImpl : public WTF::PartitionStatsDumper {
- public:
-  LightPartitionStatsDumperImpl() : total_active_bytes_(0) {}
-
-  void PartitionDumpTotals(
-      const char* partition_name,
-      const WTF::PartitionMemoryStats* memory_stats) override {
-    total_active_bytes_ += memory_stats->total_active_bytes;
-  }
-
-  void PartitionsDumpBucketStats(
-      const char* partition_name,
-      const WTF::PartitionBucketMemoryStats*) override {}
-
-  size_t TotalActiveBytes() const { return total_active_bytes_; }
-
- private:
-  size_t total_active_bytes_;
-};
-
-}  // namespace
-
 WebMemoryStatistics WebMemoryStatistics::Get() {
-  LightPartitionStatsDumperImpl dumper;
   WebMemoryStatistics statistics;
 
-  WTF::Partitions::DumpMemoryStats(true, &dumper);
-  statistics.partition_alloc_total_allocated_bytes = dumper.TotalActiveBytes();
+  statistics.partition_alloc_total_allocated_bytes =
+      WTF::GetPartitionAllocUsage();
 
   statistics.blink_gc_total_allocated_bytes =
       ProcessHeap::TotalAllocatedObjectSize() +