cros: Add UMA stat for graphics driver memory on tab discard

chrome/browser/memory_details.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/memory_details.h"
 
 #include "base/bind.h"
 #include "base/file_version_info.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
@@ skipping 441 matching lines @@
         UMA_HISTOGRAM_MEMORY_KB("Memory.PepperPluginBroker", sample);
         pepper_plugin_broker_count++;
         break;
       default:
         NOTREACHED();
         break;
     }
   }
   UMA_HISTOGRAM_MEMORY_KB("Memory.BackingStore",
                           RenderWidgetHost::BackingStoreMemorySize() / 1024);
+#if defined(OS_CHROMEOS)
+  // Chrome OS exposes system-wide graphics driver memory which has historically
+  // been a source of leak/bloat.
+  base::SystemMemoryInfoKB meminfo;
+  if (base::GetSystemMemoryInfo(&meminfo) && meminfo.gem_size != -1)
+    UMA_HISTOGRAM_MEMORY_MB("Memory.Graphics", meminfo.gem_size / 1024 / 1024);
+#endif
 
   UMA_HISTOGRAM_COUNTS_100("Memory.ProcessCount",
       static_cast<int>(browser.processes.size()));
   UMA_HISTOGRAM_COUNTS_100("Memory.ChromeProcessCount", chrome_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.ExtensionProcessCount", extension_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.OtherProcessCount", other_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.PluginProcessCount", plugin_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.PepperPluginProcessCount",
       pepper_plugin_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.PepperPluginBrokerProcessCount",
       pepper_plugin_broker_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.RendererProcessCount", renderer_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.WorkerProcessCount", worker_count);
   // TODO(viettrungluu): Do we want separate counts for the other
   // (platform-specific) process types?
 
   int total_sample = static_cast<int>(aggregate_memory / 1000);
   UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample);
 }