Add new wired memory metric to memory-infra dumps.

base/process/process_metrics.h

Index: base/process/process_metrics.h
diff --git a/base/process/process_metrics.h b/base/process/process_metrics.h
index 33cb64e24430f4bacf29d7a1ea8d3f873476f6d4..2f7e397f48b853925ee419e9b658fc85434ac1c6 100644
--- a/base/process/process_metrics.h
+++ b/base/process/process_metrics.h
@@ -154,10 +154,13 @@ class BASE_EXPORT ProcessMetrics {
   // system call.
   bool GetCommittedAndWorkingSetKBytes(CommittedKBytes* usage,
                                        WorkingSetKBytes* ws_usage) const;
-  // Returns private, shared, and total resident bytes.
+  // Returns private, shared, and total resident bytes. |wired_bytes| refers to
+  // bytes that must stay resident. |wired_bytes| only counts bytes wired by
+  // this task, not bytes wired by the kernel.
   bool GetMemoryBytes(size_t* private_bytes,
                       size_t* shared_bytes,
-                      size_t* resident_bytes) const;
+                      size_t* resident_bytes,
+                      size_t* wired_bytes) const;

[Mark Mentovai, 2017/03/28 20:56:11]

I agree with Primiano, “wired” is a very Apple-specific term. Your specific
usage here that distinguishes “wired by the task” from “wired by the kernel” is
a further twist. I don’t know that (1) overloading the terminology or (2) using
terminology obscure to the non-Mac world is helping anyone, although I wasn’t
going to say anything for (2) right here because you’re inside an OS_MACOSX.

The name used in mlock() standardization is “locked.”

[erikchen, 2017/03/30 00:03:14]

Done.

 #endif
 
   // Returns the CPU usage in percent since the last time this method or