Add renderer memory metrics

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 0f61c0fecf0dc666834cc4fd75295c85107bdf50..f5c85f06f52419dff3498c3c3e8320b2328932bc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -51412,6 +51412,103 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Renderer.Memory.DidFinishLoad.BlinkGCKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the BlinkGC allocator after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.DiscardableKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the discardable memory after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.MallocMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of the malloc after a page load.</summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.NonDiscardableTotalAllocatedMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, mainThreadIsolate()
+    and BlinkGC allocator after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.PartitionAllocKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of PartitionAlloc after a page load.</summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.TotalAllocatedMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, discardable memory,
+    mainThreadIsolate() and BlinkGC allocator after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.DidFinishLoad.V8MainThreadIsolateMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of mainThreadIsolate() after a page load.</summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.BlinkGCKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the BlinkGC allocator before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.DiscardableKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the discardable memory before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.MallocMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of the malloc before renderer shutdown.</summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.NonDiscardableTotalAllocatedMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, mainThreadIsolate()
+    and BlinkGC allocator before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.PartitionAllocKB" units="KB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of PartitionAlloc before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.TotalAllocatedMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, discardable memory,
+    mainThreadIsolate() and BlinkGC allocator before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Renderer.Memory.Shutdown.V8MainThreadIsolateMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of mainThreadIsolate() before renderer shutdown.
+  </summary>
+</histogram>
+
 <histogram name="Renderer.PixelIncreaseFromTransitions">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.