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

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index f3a616c6dc25c2b0c8ffc829d635b4d95bf7a4aa..2b9ae05f017565391dfe69e3a17f6bcbcd695647 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -29125,6 +29125,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Memory.Experimental.Gpu.PhysicalFootprint.MacOS" units="MB">
+  <owner>erikchen@chromium.org</owner>
+  <summary>
+    The physical footprint of the GPU process on macOS. Other measurements fail
+    to correctly account for OpenGL memory usage.  This metric also has flaws
+    and is not intended for permanent use.  It's an emergency measure added to
+    help debug https://crbug.com/713854.  Recorded once per UMA ping.
+  </summary>
+</histogram>
+
 <histogram base="true" name="Memory.Experimental.Renderer" units="MB">
 <!-- Name completed by histogram_suffixes name="RendererMemoryAllocator" -->
 
@@ -29208,16 +29218,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Memory.Gpu.PhysicalFootprint.MacOS" units="MB">
-  <owner>erikchen@chromium.org</owner>
-  <summary>
-    The physical footprint of the GPU process on macOS. Other measurements fail
-    to correctly account for OpenGL memory usage.  This metric also has flaws
-    and is not intended for permanent use.  It's an emergency measure added to
-    help debug https://crbug.com/713854.  Recorded once per UMA ping.
-  </summary>
-</histogram>
-
 <histogram name="Memory.Graphics" units="MB">
   <owner>hajimehoshi@chromium.org</owner>
   <owner>jamescook@chromium.org</owner>