[Merge to 3071] Change name of recently introduced metric Memory.Gpu.PhysicalFootprint.MacOS.

chrome/browser/metrics/metrics_memory_details.cc

 // Copyright 2015 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/metrics/metrics_memory_details.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 161 matching lines @@
           UMA_HISTOGRAM_COUNTS_10000("Memory.SandboxHelper.OpenFDs",
                                      num_open_fds);
         }
         other_count++;
         continue;
       case content::PROCESS_TYPE_GPU:
 #if defined(OS_MACOSX)
         // Physical footprint was introduced in macOS 10.11.
         if (base::mac::IsAtLeastOS10_11()) {
           UMA_HISTOGRAM_MEMORY_LARGE_MB(
-              "Memory.Gpu.PhysicalFootprint.MacOS",
+              "Memory.Experimental.Gpu.PhysicalFootprint.MacOS",
               browser.processes[index].phys_footprint / 1024 / 1024);
         }
 #endif
         UMA_HISTOGRAM_MEMORY_KB("Memory.Gpu", sample);
         if (num_open_fds != -1 && open_fds_soft_limit != -1) {
           UMA_HISTOGRAM_COUNTS_10000("Memory.Gpu.OpenFDs", num_open_fds);
           UMA_HISTOGRAM_COUNTS_10000("Memory.Gpu.OpenFDsSoftLimit",
                                      open_fds_soft_limit);
         }
         other_count++;
@@ skipping 188 matching lines @@
         memory_growth_tracker_->UpdateSample(process_entry.pid, sample,
                                              &diff) &&
         generate_histograms_) {
       if (diff < 0)
         UMA_HISTOGRAM_MEMORY_KB("Memory.RendererShrinkIn30Min", -diff);
       else
         UMA_HISTOGRAM_MEMORY_KB("Memory.RendererGrowthIn30Min", diff);
     }
   }
 }