libchrome_tools/patch/trace_event.patch

--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -5,6 +5,43 @@
 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_H_
 
+// Replace with stub implementation.
+#if 1
+#include "base/trace_event/common/trace_event_common.h"
+#include "base/trace_event/heap_profiler.h"
+
+// To avoid -Wunused-* errors, eat expression by macro.
+namespace libchrome_internal {
+template <typename... Args> void Ignore(Args&&... args) {}
+}
+#define INTERNAL_IGNORE(...) \
+  (false ? libchrome_internal::Ignore(__VA_ARGS__) : (void) 0)
+
+// Body is effectively empty.
+#define INTERNAL_TRACE_EVENT_ADD_SCOPED(...) INTERNAL_IGNORE(__VA_ARGS__)
+#define INTERNAL_TRACE_TASK_EXECUTION(...)
+#define INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(...) \
+  INTERNAL_IGNORE(__VA_ARGS__)
+#define TRACE_ID_MANGLE(val) (val)
+
+namespace base {
+namespace trace_event {
+
+class TraceLog {
+ public:
+  static TraceLog* GetInstance() {
+    static TraceLog instance;
+    return &instance;
+  }
+
+  pid_t process_id() { return 0; }
+  void SetCurrentThreadBlocksMessageLoop() {}
+};
+
+}  // namespace trace_event
+}  // namespace base
+#else
+
 // This header file defines implementation details of how the trace macros in
 // trace_event_common.h collect and store trace events. Anything not
 // implementation-specific should go in trace_event_common.h instead of here.
@@ -1115,4 +1152,5 @@ template<typename IDType> class TraceSco
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_
--- a/base/trace_event/heap_profiler.h
+++ b/base/trace_event/heap_profiler.h
@@ -5,6 +5,22 @@
 #ifndef BASE_TRACE_EVENT_HEAP_PROFILER_H
 #define BASE_TRACE_EVENT_HEAP_PROFILER_H
 
+// Replace with stub implementation.
+#if 1
+#define TRACE_HEAP_PROFILER_API_SCOPED_TASK_EXECUTION \
+  trace_event_internal::HeapProfilerScopedTaskExecutionTracker
+
+namespace trace_event_internal {
+
+class HeapProfilerScopedTaskExecutionTracker {
+ public:
+  explicit HeapProfilerScopedTaskExecutionTracker(const char*) {}
+};
+
+}  // namespace trace_event_internal
+
+#else
+
 #include "base/compiler_specific.h"
 #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 
@@ -86,4 +102,5 @@ class BASE_EXPORT HeapProfilerScopedIgno
 
 }  // namespace trace_event_internal
 
+#endif
 #endif  // BASE_TRACE_EVENT_HEAP_PROFILER_H
--- a/base/test/test_pending_task.h
+++ b/base/test/test_pending_task.h
@@ -10,7 +10,8 @@
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/time/time.h"
-#include "base/trace_event/trace_event_argument.h"
+// Unsupported in libchrome.
+// #include "base/trace_event/trace_event_argument.h"
 
 namespace base {
 
@@ -58,10 +59,13 @@ struct TestPendingTask {
   TimeDelta delay;
   TestNestability nestability;
 
+// Unsupported in libchrome.
+#if 0
   // Functions for using test pending task with tracing, useful in unit
   // testing.
   void AsValueInto(base::trace_event::TracedValue* state) const;
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
+#endif
   std::string ToString() const;
 
  private:
--- a/base/test/test_pending_task.cc
+++ b/base/test/test_pending_task.cc
@@ -38,6 +38,8 @@ bool TestPendingTask::ShouldRunBefore(co
 
 TestPendingTask::~TestPendingTask() {}
 
+// Unsupported in libchrome.
+#if 0
 void TestPendingTask::AsValueInto(base::trace_event::TracedValue* state) const {
   state->SetInteger("run_at", GetTimeToRun().ToInternalValue());
   state->SetString("posting_function", location.ToString());
@@ -61,10 +63,14 @@ TestPendingTask::AsValue() const {
   AsValueInto(state.get());
   return std::move(state);
 }
+#endif
 
 std::string TestPendingTask::ToString() const {
   std::string output("TestPendingTask(");
+// Unsupported in libchrome.
+#if 0
   AsValue()->AppendAsTraceFormat(&output);
+#endif
   output += ")";
   return output;
 }
---- a/base/threading/thread_id_name_manager.cc
+++ b/base/threading/thread_id_name_manager.cc
@@ -12,7 +12,8 @@
 #include "base/no_destructor.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_local.h"
-#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
+// Unsupported in libchrome.
+// #include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 
 namespace base {
 namespace {
@@ -94,8 +95,9 @@ void ThreadIdNameManager::SetName(const std::string& name) {
   // call GetName(which holds a lock) during the first allocation because it can
   // cause a deadlock when the first allocation happens in the
   // ThreadIdNameManager itself when holding the lock.
-  trace_event::AllocationContextTracker::SetCurrentThreadName(
-      leaked_str->c_str());
+  // Unsupported in libchrome.
+  // trace_event::AllocationContextTracker::SetCurrentThreadName(
+  //   leaked_str->c_str());
 }
 
 const char* ThreadIdNameManager::GetName(PlatformThreadId id) {
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -16,7 +16,8 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/shared_memory_helper.h"
-#include "base/memory/shared_memory_tracker.h"
+// Unsupported in libchrome.
+// #include "base/memory/shared_memory_tracker.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/posix/safe_strerror.h"
 #include "base/process/process_metrics.h"
@@ -302,7 +305,8 @@ bool SharedMemory::MapAt(off_t offset, size_t bytes) {
     DCHECK_EQ(0U,
               reinterpret_cast<uintptr_t>(memory_) &
                   (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
-    SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
+    // Unsupported in libchrome.
+    // SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
   } else {
     memory_ = nullptr;
   }
@@ -314,7 +318,8 @@ bool SharedMemory::Unmap() {
   if (!memory_)
     return false;
 
-  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
+  // Unsupported in libchrome.
+  // SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
   munmap(memory_, mapped_size_);
   memory_ = nullptr;
   mapped_size_ = 0;