Test virtual interface [NOT FOR REVIEW]

components/tracing/test/tracing_interface_simulator.cc

Index: components/tracing/test/tracing_interface_simulator.cc
diff --git a/components/tracing/test/tracing_interface_simulator.cc b/components/tracing/test/tracing_interface_simulator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..06938789552c03d1db484b2768107d26fcb61ae9
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+++ b/components/tracing/test/tracing_interface_simulator.cc
@@ -0,0 +1,66 @@
+// Copyright 2017 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 "tracing_interface_simulator.h"
+
+#include <string.h>
+
+#include "base/trace_event/trace_event.h"
+
+namespace tracing {
+
+namespace {
+
+class TracingImplementation;
+
+TracingImplementation *g_instance;
+
+class TracingImplementation : public TracingInterface {
+ public:
+  base::trace_event::TraceEventHandle AddEvent(
+      const char *category, const unsigned char* cat_enabled,
+      char type, const char *name, bool copy_name) const override {
+
+    return trace_event_internal::AddTraceEvent(
+        type, cat_enabled, name,
+        trace_event_internal::kGlobalScope, trace_event_internal::kNoId,
+        0u, trace_event_internal::kNoId);
+  }
+
+  const unsigned char* GetCategoryPointer(const char *category) const override {
+    const unsigned char* cat_enabled =
+        base::trace_event::TraceLog::GetCategoryGroupEnabled(category);
+    CHECK(cat_enabled);
+    return cat_enabled;
+  }
+};
+
+}  // namespace
+
+void InitTracingInterface() {
+  g_instance = new TracingImplementation();
+}
+
+const TracingInterface* GetTracingInterface() {
+  return g_instance;
+}
+
+base::trace_event::TraceEventHandle AddEventDirect(
+    const char *category, const unsigned char* cat_enabled,
+    char type, const char *name, bool copy_name) {
+
+  return trace_event_internal::AddTraceEvent(
+      type, cat_enabled, name,
+      trace_event_internal::kGlobalScope, trace_event_internal::kNoId,
+      0u, trace_event_internal::kNoId);
+}
+
+const unsigned char* GetCategoryPointerDirect(const char *category) {
+  const unsigned char* cat_enabled =
+      base::trace_event::TraceLog::GetCategoryGroupEnabled(category);
+  CHECK(cat_enabled);
+  return cat_enabled;
+}
+
+}  // namespace tracing