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"
 #include "cc/resources/bitmap_content_layer_updater.h"
 #include "cc/resources/bitmap_skpicture_content_layer_updater.h"
 #include "cc/resources/layer_painter.h"
 #include "cc/trees/layer_tree_host.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 
 namespace cc {
 
 ContentLayerPainter::ContentLayerPainter(ContentLayerClient* client)
     : client_(client) {}
 
 scoped_ptr<ContentLayerPainter> ContentLayerPainter::Create(
     ContentLayerClient* client) {
   return make_scoped_ptr(new ContentLayerPainter(client));
 }
 
 void ContentLayerPainter::Paint(SkCanvas* canvas,
                                 const gfx::Rect& content_rect,
                                 gfx::RectF* opaque) {
-  base::TimeTicks paint_start = base::TimeTicks::HighResNow();
   client_->PaintContents(canvas,
                          content_rect,
                          opaque,
                          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",
-                              pixels_per_sec / 1000000,
-                              10,
-                              210,
-                              30);
 }
 
 scoped_refptr<ContentLayer> ContentLayer::Create(ContentLayerClient* client) {
   return make_scoped_refptr(new ContentLayer(client));
 }
 
 ContentLayer::ContentLayer(ContentLayerClient* client)
     : TiledLayer(),
       client_(client),
       can_use_lcd_text_last_frame_(can_use_lcd_text()) {
@@ skipping 110 matching lines @@
   return picture;
 }
 
 void ContentLayer::OnOutputSurfaceCreated() {
   SetTextureFormat(
       layer_tree_host()->GetRendererCapabilities().best_texture_format);
   TiledLayer::OnOutputSurfaceCreated();
 }
 
 }  // namespace cc