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 06a962e5f5d7ccf149c6cb7d33398df4a5972375..a1b003972595796f767c8fc2da8db1cda5a19a01 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -26471,6 +26471,137 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Memory.Experimental.Renderer.DidFinishLoad.BlinkGCMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the BlinkGC allocator after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.DidFinishLoad.DiscardableMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the discardable memory after a page load.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.DidFinishLoad.MallocMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of the malloc after a page load.</summary>
+</histogram>
+
+<histogram
+    name="Memory.Experimental.Renderer.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="Memory.Experimental.Renderer.DidFinishLoad.PartitionAllocMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of PartitionAlloc after a page load.</summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.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="Memory.Experimental.Renderer.DidFinishLoad.TotalAllocatedPerRenderViewMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, discardable memory,
+    mainThreadIsolate() and BlinkGC allocator divided by the number of
+    RenderViews after a page load.
+  </summary>
+</histogram>
+
+<histogram
+    name="Memory.Experimental.Renderer.DidFinishLoad.V8MainThreadIsolateMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of mainThreadIsolate() after a page load.</summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.Shutdown.BlinkGCMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the BlinkGC allocator before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.Shutdown.DiscardableMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of the discardable memory before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.Shutdown.MallocMB" units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>The memory usage of the malloc before renderer shutdown.</summary>
+</histogram>
+
+<histogram
+    name="Memory.Experimental.Renderer.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="Memory.Experimental.Renderer.Shutdown.PartitionAllocMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of PartitionAlloc before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.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="Memory.Experimental.Renderer.Shutdown.TotalAllocatedPerRenderViewMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The sum of the memory usages of PartitionAlloc, malloc, discardable memory,
+    mainThreadIsolate() and BlinkGC allocator divided by the number of
+    RenderViews before renderer shutdown.
+  </summary>
+</histogram>
+
+<histogram name="Memory.Experimental.Renderer.Shutdown.V8MainThreadIsolateMB"
+    units="MB">
+  <owner>keishi@chromium.org</owner>
+  <summary>
+    The memory usage of mainThreadIsolate() before renderer shutdown.
+  </summary>
+</histogram>
+
 <histogram name="Memory.Extension" units="KB">
   <owner>hajimehoshi@chromium.org</owner>
   <owner>kenjibaheux@google.com</owner>