cc: Add UMA stats for record and raster time.

cc/resources/picture_pile.cc

Index: cc/resources/picture_pile.cc
diff --git a/cc/resources/picture_pile.cc b/cc/resources/picture_pile.cc
index 1b814477b427f3324d0f5b9048187d5c658e949a..64a51eb5dab109a89f01f176184edd826a44d212 100644
--- a/cc/resources/picture_pile.cc
+++ b/cc/resources/picture_pile.cc
@@ -8,6 +8,7 @@
 #include <limits>
 #include <vector>
 
+#include "base/numerics/safe_math.h"
 #include "cc/base/region.h"
 #include "cc/resources/picture_pile_impl.h"
 #include "skia/ext/analysis_canvas.h"
@@ -180,7 +181,8 @@ bool PicturePile::UpdateAndExpandInvalidation(
     const gfx::Size& layer_size,
     const gfx::Rect& visible_layer_rect,
     int frame_number,
-    RecordingSource::RecordingMode recording_mode) {
+    RecordingSource::RecordingMode recording_mode,
+    int* recorded_area) {
   gfx::Rect interest_rect = visible_layer_rect;
   interest_rect.Inset(-pixel_record_distance_, -pixel_record_distance_);
   recorded_viewport_ = interest_rect;
@@ -194,6 +196,13 @@ bool PicturePile::UpdateAndExpandInvalidation(
   std::vector<gfx::Rect> record_rects;
   ClusterTiles(invalid_tiles, &record_rects);
 
+  if (recorded_area) {
+    base::CheckedNumeric<int> area = 0;
+    for (const auto& record_rect : record_rects)
+      area += record_rect.size().GetArea();
+    *recorded_area = area.ValueOrDefault(std::numeric_limits<int>::max());
+  }
+
   if (record_rects.empty())
     return updated;