Update the tcmalloc chromium branch to r144 (gperftools 2.0), and merge chromium-specific changes.

third_party/tcmalloc/chromium/src/static_vars.cc

Index: third_party/tcmalloc/chromium/src/static_vars.cc
diff --git a/third_party/tcmalloc/chromium/src/static_vars.cc b/third_party/tcmalloc/chromium/src/static_vars.cc
index 2ca132e46eab49da5e2c91fa2544d282ad260a0c..6fc852a82d1f2edb6e48f8d6ce2f100f80b4feab 100644
--- a/third_party/tcmalloc/chromium/src/static_vars.cc
+++ b/third_party/tcmalloc/chromium/src/static_vars.cc
@@ -34,6 +34,7 @@
 #include <stddef.h>                     // for NULL
 #include <new>                          // for operator new
 #include "internal_logging.h"  // for CHECK_CONDITION
+#include "common.h"
 #include "sampler.h"           // for Sampler
 
 namespace tcmalloc {
@@ -46,7 +47,7 @@ PageHeapAllocator<StackTrace> Static::stacktrace_allocator_;
 Span Static::sampled_objects_;
 PageHeapAllocator<StackTraceTable::Bucket> Static::bucket_allocator_;
 StackTrace* Static::growth_stacks_ = NULL;
-char Static::pageheap_memory_[sizeof(PageHeap)];
+PageHeap* Static::pageheap_ = NULL;
 
 void Static::InitStaticVars() {
   sizemap_.Init();
@@ -60,7 +61,11 @@ void Static::InitStaticVars() {
   for (int i = 0; i < kNumClasses; ++i) {
     central_cache_[i].Init(i);
   }
-  new ((void*)pageheap_memory_) PageHeap;
+  // It's important to have PageHeap allocated, not in static storage,
+  // so that HeapLeakChecker does not consider all the byte patterns stored
+  // in is caches as pointers that are sources of heap object liveness,
+  // which leads to it missing some memory leaks.
+  pageheap_ = new (MetaDataAlloc(sizeof(PageHeap))) PageHeap;
   DLL_Init(&sampled_objects_);
   Sampler::InitStatics();
 }