Add heap allocator usage to task profiler.

base/debug/thread_heap_usage_tracker.cc

Index: base/debug/thread_heap_usage_tracker.cc
diff --git a/base/debug/thread_heap_usage_tracker.cc b/base/debug/thread_heap_usage_tracker.cc
index b9018e0c7056e2aa578e1586c462e88f58ea4008..2b95823e273f0579b567c33102a5de76544aeec1 100644
--- a/base/debug/thread_heap_usage_tracker.cc
+++ b/base/debug/thread_heap_usage_tracker.cc
@@ -159,7 +159,10 @@ ThreadHeapUsageTracker::ThreadHeapUsageTracker() : thread_usage_(nullptr) {
 }
 
 ThreadHeapUsageTracker::~ThreadHeapUsageTracker() {
-  DCHECK(thread_checker_.CalledOnValidThread());
+  // TODO(fdoray): This DCHECK causes inexplicable fallout in Chrome. This
+  //    was isolated to a line in CalledOnValidThread reading.
+  // if (task_token_ == TaskToken::GetForCurrentThread())
+  // DCHECK(thread_checker_.CalledOnValidThread());
 
   if (thread_usage_ != nullptr) {
     // If this tracker wasn't stopped, make it inclusive so that the