Add about:memory support for Linux....

chrome/browser/memory_details.h

Index: chrome/browser/memory_details.h
===================================================================
--- chrome/browser/memory_details.h	(revision 22256)
+++ chrome/browser/memory_details.h	(working copy)
@@ -17,8 +17,9 @@
 // have multiple processes (of course!).  Even IE has multiple
 // processes these days.
 struct ProcessMemoryInformation {
-  ProcessMemoryInformation() {
-    memset(this, 0, sizeof(ProcessMemoryInformation));
+  ProcessMemoryInformation() : pid(0),
+                               num_processes(0),
+                               is_diagnostics(false) {
   }
 
   // The process id.
@@ -71,18 +72,6 @@
 //    }
 class MemoryDetails : public base::RefCountedThreadSafe<MemoryDetails> {
  public:
-  // Known browsers which we collect details for.
-  enum {
-    CHROME_BROWSER = 0,
-    IE_BROWSER,
-    FIREFOX_BROWSER,
-    OPERA_BROWSER,
-    SAFARI_BROWSER,
-    IE_64BIT_BROWSER,
-    KONQUEROR_BROWSER,
-    MAX_BROWSERS
-  } BrowserProcess;
-
   // Constructor.
   MemoryDetails();
   virtual ~MemoryDetails() {}
@@ -90,7 +79,7 @@
   // Access to the process detail information.  This is an array
   // of MAX_BROWSER ProcessData structures.  This data is only available
   // after OnDetailsAvailable() has been called.
-  ProcessData* processes() { return process_data_; }
+  const std::vector<ProcessData>& processes() { return process_data_; }
 
   // Initiate updating the current memory details.  These are fetched
   // asynchronously because data must be collected from multiple threads.
@@ -123,7 +112,10 @@
   // the global histograms for tracking memory usage.
   void UpdateHistograms();
 
-  ProcessData process_data_[MAX_BROWSERS];
+  // Returns a pointer to the ProcessData structure for Chrome.
+  ProcessData* ChromeBrowser();
+
+  std::vector<ProcessData> process_data_;
   MessageLoop* ui_loop_;
 
   DISALLOW_EVIL_CONSTRUCTORS(MemoryDetails);