Only enable heap tracking under --enable-heap-profiling=task-profiler.

base/base_switches.cc

Index: base/base_switches.cc
diff --git a/base/base_switches.cc b/base/base_switches.cc
index f5c6eb3f59bb78f81f313436c11e8609efadd8a1..b6d4c72a207ce366e81cb9449ef6f64f9d8cfd8a 100644
--- a/base/base_switches.cc
+++ b/base/base_switches.cc
@@ -24,6 +24,9 @@ const char kEnableHeapProfiling[]           = "enable-heap-profiling";
 // derived from trace events are reported.
 const char kEnableHeapProfilingModeNative[] = "native";
 
+// Report heap usage and churn in the task profiler (chrome://profiler).

[Primiano Tucci (use gerrit), 2017/02/15 14:18:03]

can you add: "Does not keep track of individual allocations unlike the default
and native mode. Keeps only track of summarized churn stats in the task profiler
(chrome://profiler)"

[Sigurður Ásgeirsson, 2017/02/15 15:35:45]

Done.

+const char kEnableHeapProfilingTaskProfiler[] = "task-profiler";
+
 // Generates full memory crash dump.
 const char kFullMemoryCrashReport[]         = "full-memory-crash-report";