cc: Remove AccelContentPaintDurationMS and related histos.

cc/layers/content_layer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/content_layer.h"
 
 #include "base/auto_reset.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "cc/layers/content_layer_client.h"
@@ skipping 23 matching lines @@
                          ContentLayerClient::GRAPHICS_CONTEXT_ENABLED);
   base::TimeTicks paint_end = base::TimeTicks::HighResNow();
   // The start and end times might be the same if the paint was very fast or if
   // our timer granularity is poor. Treat this as a very short time duration
   // instead of none to avoid dividing by zero.
   if (paint_end == paint_start)
     paint_end += base::TimeDelta::FromMicroseconds(1);
 
   double pixels_per_sec = (content_rect.width() * content_rect.height()) /
                           (paint_end - paint_start).InSecondsF();
-  UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.AccelContentPaintDurationMS",
-                              (paint_end - paint_start).InMilliseconds(),
-                              0,
-                              120,
-                              30);
   UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.AccelContentPaintMegapixPerSecond",

[danakj, 2014/05/12 15:57:53]

Let's delete this one too? It's coming from the same noisy data. And we can drop
the paint_end/paint_start stuff then if it's not being used anymore.

                               pixels_per_sec / 1000000,
                               10,
                               210,
                               30);
 }
 
 scoped_refptr<ContentLayer> ContentLayer::Create(ContentLayerClient* client) {
   return make_scoped_refptr(new ContentLayer(client));
 }
 
@@ skipping 114 matching lines @@
   return picture;
 }
 
 void ContentLayer::OnOutputSurfaceCreated() {
   SetTextureFormat(
       layer_tree_host()->GetRendererCapabilities().best_texture_format);
   TiledLayer::OnOutputSurfaceCreated();
 }
 
 }  // namespace cc