PartitionAllocMemoryDumpProvider can directly inherit from MemoryDumpProvider

base/trace_event/process_memory_dump.cc

 // Copyright 2015 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 "base/trace_event/process_memory_dump.h"
 
 #include <errno.h>
 
 #include <vector>
 
 #include "base/memory/ptr_util.h"
 #include "base/process/process_metrics.h"
+#include "base/strings/stringprintf.h"
+#include "base/trace_event/heap_profiler_heap_dump_writer.h"
 #include "base/trace_event/process_memory_totals.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "build/build_config.h"
 
 #if defined(OS_IOS)
 #include <sys/sysctl.h>
 #endif
 
 #if defined(OS_POSIX)
 #include <sys/mman.h>
@@ skipping 193 matching lines @@
     const MemoryAllocatorDumpGuid& guid) const {
   return GetAllocatorDump(GetSharedGlobalAllocatorDumpName(guid));
 }
 
 void ProcessMemoryDump::AddHeapDump(const std::string& absolute_name,
                                     std::unique_ptr<TracedValue> heap_dump) {
   DCHECK_EQ(0ul, heap_dumps_.count(absolute_name));
   heap_dumps_[absolute_name] = std::move(heap_dump);
 }
 
+void ProcessMemoryDump::DumpHeapUsage(
+    const base::hash_map<base::trace_event::AllocationContext,
+        base::trace_event::AllocationMetrics>& metrics_by_context,
+    base::trace_event::TraceEventMemoryOverhead& overhead,
+    const char* allocator_name) {
+  if (!metrics_by_context.empty()) {
+    std::unique_ptr<TracedValue> heap_dump = ExportHeapDump(
+        metrics_by_context, *session_state());
+    AddHeapDump(allocator_name, std::move(heap_dump));
+  }
+
+  std::string base_name = base::StringPrintf("tracing/heap_profiler_%s",
+                                             allocator_name);
+  overhead.DumpInto(base_name.c_str(), this);
+}
+
 void ProcessMemoryDump::Clear() {
   if (has_process_totals_) {
     process_totals_.Clear();
     has_process_totals_ = false;
   }
 
   if (has_process_mmaps_) {
     process_mmaps_.Clear();
     has_process_mmaps_ = false;
   }
@@ skipping 79 matching lines @@
 
 void ProcessMemoryDump::AddSuballocation(const MemoryAllocatorDumpGuid& source,
                                          const std::string& target_node_name) {
   std::string child_mad_name = target_node_name + "/__" + source.ToString();
   MemoryAllocatorDump* target_child_mad = CreateAllocatorDump(child_mad_name);
   AddOwnershipEdge(source, target_child_mad->guid());
 }
 
 }  // namespace trace_event
 }  // namespace base