Add a histogram for renderer memory usage.

webkit/glue/webkit_glue.cc

Index: webkit/glue/webkit_glue.cc
diff --git a/webkit/glue/webkit_glue.cc b/webkit/glue/webkit_glue.cc
index 6dcca02e885a00c08069ea7e4acbc703ddb2a7af..a5174f5680c6b6dd73d315ee31e38c90ea554a62 100644
--- a/webkit/glue/webkit_glue.cc
+++ b/webkit/glue/webkit_glue.cc
@@ -11,11 +11,16 @@
 #include <sys/utsname.h>
 #endif
 
+#if defined(OS_LINUX)
+#include <malloc.h>
+#endif
+
 #include <limits>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/process_util.h"
 #include "base/string_piece.h"
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
@@ -334,4 +339,37 @@ void ConfigureURLRequestForReferrerPolicy(
 
 COMPILE_ASSERT(std::numeric_limits<double>::has_quiet_NaN, has_quiet_NaN);
 
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+size_t MemoryUsageKB() {
+  struct mallinfo minfo = mallinfo();
+  uint64_t mem_usage =
+#if defined(USE_TCMALLOC)
+      minfo.uordblks
+#else
+      (minfo.hblkhd + minfo.arena)
+#endif
+      >> 10;
+
+  v8::HeapStatistics stat;
+  v8::V8::GetHeapStatistics(&stat);
+  return mem_usage + (static_cast<uint64_t>(stat.total_heap_size()) >> 10);
+}
+#elif defined(OS_MACOSX)
+size_t MemoryUsageKB() {
+  scoped_ptr<base::ProcessMetrics> process_metrics(
+      // The default port provider is sufficient to get data for the current
+      // process.
+      base::ProcessMetrics::CreateProcessMetrics(
+          base::GetCurrentProcessHandle(), NULL));
+  return process_metrics->GetWorkingSetSize() >> 10;
+}
+#else
+size_t MemoryUsageKB() {
+  scoped_ptr<base::ProcessMetrics> process_metrics(
+      base::ProcessMetrics::CreateProcessMetrics(
+          base::GetCurrentProcessHandle()));
+  return process_metrics->GetPagefileUsage() >> 10;
+}
+#endif
+
 } // namespace webkit_glue