cc: Add UMA stats for record and raster time.

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 6faf767739fe7c8fe5c0e76489c6382fd6464e18..ec544cbd2d34bf4c6d1f3696b5074d643198fabc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -31100,6 +31100,22 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Renderer4.DisplayListRecordingSourcePixelsPerMs">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Area of recorded content, in pixels, divided by display list update time, in
+    milliseconds.
+  </summary>
+</histogram>
+
+<histogram name="Renderer4.DisplayListRecordingSourceUpdateUs"
+    units="microseconds">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Time spent updating (i.e. recording) a display list, in microseconds.
+  </summary>
+</histogram>
+
 <histogram name="Renderer4.drawPixelCountCulled" units="NormalizedPixels">
   <obsolete>
     Renamed to Renderer4.pixelCountCulled_Draw.
@@ -31238,6 +31254,21 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Renderer4.PicturePileUpdatePixelsPerMs">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Area of recorded content, in pixels, divided by picture pile update time, in
+    milliseconds.
+  </summary>
+</histogram>
+
+<histogram name="Renderer4.PicturePileUpdateUs" units="microseconds">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Time spent updating (i.e. recording) a picture pile, in microseconds.
+  </summary>
+</histogram>
+
 <histogram name="Renderer4.pixelCountCulled_Draw" units="NormalizedPixels">
   <owner>wiltzius@chromium.org</owner>
   <summary>
@@ -31273,6 +31304,21 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Renderer4.RasterTaskPixelsPerMs">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Rasterized area, in pixels, divided by rasterization time, in milliseconds,
+    of a compositor rasterization task.
+  </summary>
+</histogram>
+
+<histogram name="Renderer4.RasterTaskUs" units="microseconds">
+  <owner>paint-dev@chromium.org</owner>
+  <summary>
+    Time spent completing a compositor rasterization task, in microseconds.
+  </summary>
+</histogram>
+
 <histogram name="Renderer4.renderPassCount">
   <owner>wiltzius@chromium.org</owner>
   <summary>