cc: CompositorTimingHistory throughput UMAs

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 4b4fd284c7eb517f0c91bb536e9a508496e4d088..64ad3f007e2351adfe4d87debf22cee1242546cb 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -41275,6 +41275,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Scheduling.BeginMainFrameIntervalCritical"
+    units="microseconds">
+  <owner>brianderson@chromium.org</owner>
+  <summary>
+    This is the time delta between back-to-back BeginMainFrames completions on
+    the compositor side when the on_critical_path flag is set, regardless of
+    whether they abort (have no updates) or commit (have updates).
+
+    The interval is only recorded when the BeginMainFrames are running
+    continuously; sepcifically when another BeginMainFrame is requested by the
+    next BeginImplFrame after a) an abort or b) activation.
+  </summary>
+</histogram>
+
+<histogram name="Scheduling.BeginMainFrameIntervalNotCritical"
+    units="microseconds">
+  <owner>brianderson@chromium.org</owner>
+  <summary>
+    This is the time delta between back-to-back BeginMainFrames completions on
+    the compositor side when the on_critical_path flag is not set, regardless of
+    whether they abort (have no updates) or commit (have updates).
+
+    The interval is only recorded when the BeginMainFrames are running
+    continuously; sepcifically when another BeginMainFrame is requested by the
+    next BeginImplFrame after a) an abort or b) activation.
+  </summary>
+</histogram>
+
 <histogram name="Scheduling.BeginMainFrameQueueDurationCritical"
     units="microseconds">
   <owner>brianderson@chromium.org</owner>
@@ -41308,11 +41336,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
     units="microseconds">
   <owner>brianderson@chromium.org</owner>
   <summary>
-    How long it takes for the blink main thread to respond to the compositors
+    How long it takes for the blink main thread to respond to the compositor's
     SendBeginMainFrame.
   </summary>
 </histogram>
 
+<histogram name="Scheduling.CommitInterval" units="microseconds">
+  <owner>brianderson@chromium.org</owner>
+  <summary>
+    The time delta between the *draw* times of back-to-back BeginMainFrames that
+    result in a commit.
+
+    The interval is only recorded when the BeginMainFrames are running and
+    committing continuously, where continuously means when another
+    BeginMainFrame is requested by the next BeginImplFrame after activation.
+  </summary>
+</histogram>
+
 <histogram name="Scheduling.CommitToReadyToActivateDuration"
     units="microseconds">
   <owner>brianderson@chromium.org</owner>
@@ -41327,6 +41367,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>How long it takes the compositor to draw a frame.</summary>
 </histogram>
 
+<histogram name="Scheduling.DrawInterval" units="microseconds">
+  <owner>brianderson@chromium.org</owner>
+  <summary>
+    The time delta between the draw times of back-to-back BeginImplFrames,
+    regardless of whether or not they result in a swap.
+
+    The interval is only recorded when every BeginImplFrame wants to draw.
+  </summary>
+</histogram>
+
 <histogram name="Scheduling.PrepareTilesDuration" units="microseconds">
   <owner>brianderson@chromium.org</owner>
   <summary>
@@ -77973,9 +78023,13 @@ To add a new entry, add it with any value and run test to compute valid value.
     ordering="prefix">
   <suffix name="Browser"/>
   <suffix name="Renderer"/>
+  <affected-histogram name="Scheduling.BeginMainFrameIntervalCritical"/>
+  <affected-histogram name="Scheduling.BeginMainFrameIntervalNotCritical"/>
   <affected-histogram name="Scheduling.BeginMainFrameQueueDurationCritical"/>
   <affected-histogram name="Scheduling.BeginMainFrameQueueDurationNotCritical"/>
   <affected-histogram name="Scheduling.BeginMainFrameStartToCommitDuration"/>
+  <affected-histogram name="Scheduling.CommitInterval"/>
+  <affected-histogram name="Scheduling.DrawInterval"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="CompositorTimingHistorySubcategory" separator=".">