Remove some of the instrumentation plumbing

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index c785cf6fd7fec0b0b4c17985ef1be5f7540efaa0..4b86c806f8f3806d405e9a77a149db5134320cd4 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -97,7 +97,7 @@ class RasterTaskImpl : public RasterTask {
     DCHECK(raster_source);
 
     raster_source->PerformSolidColorAnalysis(
-        content_rect_, contents_scale_, &analysis_, rendering_stats_);
+        content_rect_, contents_scale_, &analysis_);
 
     // Record the solid color prediction.
     UMA_HISTOGRAM_BOOLEAN("Renderer4.SolidColorTilesAnalyzed",
@@ -113,30 +113,10 @@ class RasterTaskImpl : public RasterTask {
     devtools_instrumentation::ScopedLayerTask layer_task(
         devtools_instrumentation::kRasterTask, layer_id_);
 
-    base::TimeDelta prev_rasterize_time =
-        rendering_stats_->impl_thread_rendering_stats().rasterize_time;
-
-    // Only record rasterization time for highres tiles, because
-    // lowres tiles are not required for activation and therefore
-    // introduce noise in the measurement (sometimes they get rasterized
-    // before we draw and sometimes they aren't)
-    RenderingStatsInstrumentation* stats =
-        tile_resolution_ == HIGH_RESOLUTION ? rendering_stats_ : NULL;
     DCHECK(raster_source);
 
     raster_buffer_->Playback(
-        raster_source_.get(), content_rect_, contents_scale_, stats);
-
-    if (rendering_stats_->record_rendering_stats()) {
-      base::TimeDelta current_rasterize_time =
-          rendering_stats_->impl_thread_rendering_stats().rasterize_time;
-      LOCAL_HISTOGRAM_CUSTOM_COUNTS(

[ernstm, 2014/10/30 20:18:48]

Does anybody know what this histogram is?

-          "Renderer4.PictureRasterTimeUS",
-          (current_rasterize_time - prev_rasterize_time).InMicroseconds(),
-          0,
-          100000,
-          100);
-    }
+        raster_source_.get(), content_rect_, contents_scale_);
   }
 
   RasterSource::SolidColorAnalysis analysis_;