Add about:memory support for Linux....

base/process_util.h

Index: base/process_util.h
===================================================================
--- base/process_util.h	(revision 22256)
+++ base/process_util.h	(working copy)
@@ -293,6 +293,7 @@
 // shared :        These pages (kbytes) are currently shared with at least one
 //                 other process.
 struct WorkingSetKBytes {
+  WorkingSetKBytes() : priv(0), shareable(0), shared(0) {}
   size_t priv;
   size_t shareable;
   size_t shared;
@@ -305,6 +306,7 @@
 // image:   These pages are mapped into the view of an image section (backed by
 //          file system)
 struct CommittedKBytes {
+  CommittedKBytes() : priv(0), mapped(0), image(0) {}
   size_t priv;
   size_t mapped;
   size_t image;