Add a benchmarking_extension API to call TCMalloc's HeapProfilerDump().

content/renderer/memory_benchmarking_extension.cc

Index: content/renderer/memory_benchmarking_extension.cc
diff --git a/content/renderer/memory_benchmarking_extension.cc b/content/renderer/memory_benchmarking_extension.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6918ac7f97f45c2460b6cb5f7631078c42b75016
--- /dev/null
+++ b/content/renderer/memory_benchmarking_extension.cc
@@ -0,0 +1,80 @@
+// Copyright (c) 2013 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 "content/renderer/memory_benchmarking_extension.h"
+
+#include "base/string_util.h"
+#include "content/public/renderer/render_thread.h"
+
+#if !defined(NO_TCMALLOC) && defined(OS_LINUX)
+#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
+#endif  // !defined(NO_TCMALLOC) && defined(OS_LINUX)
+
+namespace {
+
+const char kMemoryBenchmarkingExtensionName[] = "v8/MemoryBenchmarking";
+
+}
+
+namespace {
+
+class MemoryBenchmarkingWrapper : public v8::Extension {
+ public:
+  MemoryBenchmarkingWrapper() :
+      v8::Extension(kMemoryBenchmarkingExtensionName,
+        "if (typeof(chrome) == 'undefined') {"
+        "  chrome = {};"
+        "};"
+        "if (typeof(chrome.memoryBenchmarking) == 'undefined') {"
+        "  chrome.memoryBenchmarking = {};"
+        "};"
+        "chrome.memoryBenchmarking.isHeapProfilerRunning = function() {"
+        "  native function IsHeapProfilerRunning();"
+        "  return IsHeapProfilerRunning();"
+        "};"
+        "chrome.memoryBenchmarking.heapProfilerDump = function(reason) {"
+        "  native function HeapProfilerDump();"
+        "  HeapProfilerDump(reason);"
+        "};"
+        ) {}
+
+  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
+      v8::Handle<v8::String> name) {
+    if (name->Equals(v8::String::New("IsHeapProfilerRunning")))
+      return v8::FunctionTemplate::New(IsHeapProfilerRunning);
+    else if (name->Equals(v8::String::New("HeapProfilerDump")))
+      return v8::FunctionTemplate::New(HeapProfilerDump);
+
+    return v8::Handle<v8::FunctionTemplate>();
+  }
+
+  static v8::Handle<v8::Value> IsHeapProfilerRunning(
+      const v8::Arguments& args) {
+#if !defined(NO_TCMALLOC) && defined(OS_LINUX)
+    return v8::Boolean::New(::IsHeapProfilerRunning());
+#else
+    return v8::Boolean::New(false);
+#endif  // !defined(NO_TCMALLOC) && defined(OS_LINUX)
+  }
+
+  static v8::Handle<v8::Value> HeapProfilerDump(const v8::Arguments& args) {
+#if !defined(NO_TCMALLOC) && defined(OS_LINUX)
+    std::string reason("benchmarking_extension");
+    if (args.Length() && args[0]->IsString())
+      reason = *v8::String::AsciiValue(args[0]);
+    ::HeapProfilerDump(reason.c_str());
+#endif  // !defined(NO_TCMALLOC) && defined(OS_LINUX)
+    return v8::Undefined();
+  }
+};
+
+}  // namespace
+
+namespace content {
+
+v8::Extension* MemoryBenchmarkingExtension::Get() {
+  return new MemoryBenchmarkingWrapper();
+}
+
+}  // namespace content