Mac: Implement about:memory.

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index d6e44a113481c9752f5c3c4e4008c7cd633f3d95..184d8195ad00fe7b904a6c430cc090123cae041a 100755
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -1764,6 +1764,7 @@
         'browser/login_prompt_win.cc',
         'browser/memory_details.cc',
         'browser/memory_details_linux.cc',
+        'browser/memory_details_mac.cc',
         'browser/memory_details_win.cc',
         'browser/memory_details.h',
         'browser/memory_purger.cc',
@@ -1935,6 +1936,8 @@
         'browser/privacy_blacklist/blacklist_store.cc',
         'browser/privacy_blacklist/blocked_response.h',
         'browser/privacy_blacklist/blocked_response.cc',
+        'browser/process_info_snapshot_mac.cc',
+        'browser/process_info_snapshot.h',
         'browser/process_singleton.h',
         'browser/process_singleton_linux.cc',
         'browser/process_singleton_mac.cc',
@@ -4651,6 +4654,7 @@
         'browser/privacy_blacklist/blacklist_manager_unittest.cc',
         'browser/privacy_blacklist/blacklist_unittest.cc',
         'browser/privacy_blacklist/blacklist_io_unittest.cc',
+        'browser/process_info_snapshot_mac_unittest.cc',
         'browser/profile_manager_unittest.cc',
         'browser/renderer_host/audio_renderer_host_unittest.cc',
         'browser/renderer_host/render_widget_host_unittest.cc',