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 7b3670490ea77bea5c18d32745e1e87f71438dd3..0548b2439b57c33f0c828583407c5cf542a4b252 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -26744,6 +26744,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram base="true" name="Memory.Experimental.Renderer" units="MB">
+<!-- Name completed by histogram_suffixes name="RendererMemoryAllocator" -->
+
+  <owner>keishi@chromium.org</owner>
+  <summary>The renderer process's memory usage after a page load.</summary>
+</histogram>
+
 <histogram name="Memory.Extension" units="KB">
   <owner>hajimehoshi@chromium.org</owner>
   <owner>kenjibaheux@google.com</owner>
@@ -115257,6 +115264,45 @@ value.
   <affected-histogram name="Event.Latency.RendererImpl"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="RendererMemoryAllocator" separator=".">
+  <suffix base="true" name="BlinkGC"
+      label="Constrained to the BlinkGC allocator"/>
+  <suffix base="true" name="Discardable"
+      label="Constrained to discardable memory usage"/>
+  <suffix base="true" name="Malloc" label="Constrained to malloc usage"/>
+  <suffix base="true" name="NonDiscardableTotalAllocated"
+      label="Summed over the PartitionAlloc, malloc, mainThreadIsolate() and
+             BlinkGC allocators"/>
+  <suffix base="true" name="PartitionAlloc"
+      label="Constrained to the PartitionAlloc allocator"/>
+  <suffix base="true" name="TotalAllocatedPerRenderView"
+      label="TotalAllocated divided by the number of RenderViews"/>
+  <suffix base="true" name="V8MainThreadIsolate"
+      label="Constrained to memory usage by mainThreadIsolate()"/>
+  <suffix base="true" name="TotalAllocated"
+      label="Summed over the PartitionAlloc, malloc, discardable memory,
+             mainThreadIsolate() and BlinkGC allocators"/>
+  <affected-histogram name="Memory.Experimental.Renderer"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="RendererMemoryTiming" separator=".">
+  <suffix name="DidFinishLoad"
+      label="Recorded each time DidFinishLoad is called for *any* frame
+             within the page."/>
+  <suffix name="MainFrameDidFinishLoad"
+      label="Recorded when DidFinishLoad is called for the main frame."/>
+  <affected-histogram name="Memory.Experimental.Renderer.BlinkGC"/>
+  <affected-histogram name="Memory.Experimental.Renderer.Discardable"/>
+  <affected-histogram name="Memory.Experimental.Renderer.Malloc"/>
+  <affected-histogram
+      name="Memory.Experimental.Renderer.NonDiscardableTotalAllocated"/>
+  <affected-histogram name="Memory.Experimental.Renderer.PartitionAlloc"/>
+  <affected-histogram name="Memory.Experimental.Renderer.TotalAllocated"/>
+  <affected-histogram
+      name="Memory.Experimental.Renderer.TotalAllocatedPerRenderView"/>
+  <affected-histogram name="Memory.Experimental.Renderer.V8MainThreadIsolate"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="RequestMediaKeySystemAccessKeySystems" separator=".">
   <suffix name="ClearKey" label="Requests for the Clear Key key system."/>
   <suffix name="Unknown"