Store alloc history data in memory leak report protobuf

components/metrics/leak_detector/leak_detector.cc

Index: components/metrics/leak_detector/leak_detector.cc
diff --git a/components/metrics/leak_detector/leak_detector.cc b/components/metrics/leak_detector/leak_detector.cc
index a7151a86382990e1313982dc2be1c41bfd2d287b..45fb32e698e15cad51133df918717b997fe55652 100644
--- a/components/metrics/leak_detector/leak_detector.cc
+++ b/components/metrics/leak_detector/leak_detector.cc
@@ -6,6 +6,8 @@
 
 #include <stdint.h>
 
+#include <algorithm>
+
 #include "base/allocator/allocator_extension.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ -24,7 +26,6 @@
 
 namespace metrics {
 
-using LeakReport = LeakDetector::LeakReport;
 using InternalLeakReport = leak_detector::LeakDetectorImpl::LeakReport;
 template <typename T>
 using InternalVector = leak_detector::LeakDetectorImpl::InternalVector<T>;
@@ -100,25 +101,26 @@ inline uint64_t PointerToHash(const void* ptr) {
   return reinterpret_cast<uint64_t>(ptr) * kMultiplier;
 }
 
-// Converts a vector of leak reports generated by LeakDetectorImpl
-// (InternalLeakReport) to a vector of leak reports suitable for sending to
-// LeakDetector's observers (LeakReport).
-void GetReportsForObservers(
-    const InternalVector<InternalLeakReport>& leak_reports,
-    std::vector<LeakReport>* reports_for_observers) {
-  reports_for_observers->clear();
-  reports_for_observers->reserve(leak_reports.size());
-  for (const InternalLeakReport& report : leak_reports) {
-    reports_for_observers->push_back(LeakReport());
-    LeakReport* new_report = &reports_for_observers->back();
-
-    new_report->alloc_size_bytes = report.alloc_size_bytes();
-    if (!report.call_stack().empty()) {
-      new_report->call_stack.resize(report.call_stack().size());
-      memcpy(new_report->call_stack.data(), report.call_stack().data(),
-             report.call_stack().size() * sizeof(report.call_stack()[0]));
+// Converts an memory leak report generated by LeakDetectorImpl
+// (InternalLeakReport) to protobuf format (MemoryLeakReportProto).
+MemoryLeakReportProto ConvertLeakReportToProto(
+    const InternalLeakReport& report) {
+  MemoryLeakReportProto proto;
+
+  proto.set_size_bytes(report.alloc_size_bytes());
+  for (auto call_stack_entry : report.call_stack()) {
+    proto.add_call_stack(call_stack_entry);
+  }
+
+  for (const auto& entry : report.alloc_breakdown_history()) {
+    auto* proto_entry = proto.add_alloc_breakdown_history();
+    for (const uint32_t count : entry.counts_by_size) {
+      proto_entry->add_counts_by_size(count);
     }
+    proto_entry->set_count_for_call_stack(entry.count_for_call_stack);
   }
+
+  return proto;
 }
 
 // The only instance of LeakDetector that should be used.
@@ -153,12 +155,6 @@ inline void StoreHookDataToTLS(HookData hook_data) {
 
 }  // namespace
 
-LeakDetector::LeakReport::LeakReport() {}
-
-LeakDetector::LeakReport::LeakReport(const LeakReport& other) = default;
-
-LeakDetector::LeakReport::~LeakReport() {}
-
 // static
 LeakDetector* LeakDetector::GetInstance() {
   return g_instance.Pointer();
@@ -274,9 +270,10 @@ void LeakDetector::AllocHook(const void* ptr, size_t size) {
       detector->impl_->TestForLeaks(&leak_reports);
 
       // Pass leak reports to observers.
-      std::vector<LeakReport> leak_reports_for_observers;
-      GetReportsForObservers(leak_reports, &leak_reports_for_observers);
-      detector->NotifyObservers(leak_reports_for_observers);
+      std::vector<MemoryLeakReportProto> leak_report_protos;
+      std::transform(leak_reports.begin(), leak_reports.end(),
+                     leak_report_protos.begin(), &ConvertLeakReportToProto);
+      detector->NotifyObservers(leak_report_protos);
     }
   }
 
@@ -319,7 +316,8 @@ inline bool LeakDetector::ShouldSample(const void* ptr) const {
   return PointerToHash(ptr) < sampling_factor_;
 }
 
-void LeakDetector::NotifyObservers(const std::vector<LeakReport>& reports) {
+void LeakDetector::NotifyObservers(
+    const std::vector<MemoryLeakReportProto>& reports) {
   if (reports.empty())
     return;
 
@@ -331,9 +329,9 @@ void LeakDetector::NotifyObservers(const std::vector<LeakReport>& reports) {
     return;
   }
 
-  for (const LeakReport& report : reports) {
+  {
     base::AutoLock lock(observers_lock_);
-    FOR_EACH_OBSERVER(Observer, observers_, OnLeakFound(report));
+    FOR_EACH_OBSERVER(Observer, observers_, OnLeaksFound(reports));
   }
 }