cc: Calculate "can use lcd text" on the compositor thread

cc/trees/layer_tree_host.cc

 // Copyright 2011 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/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 115 matching lines @@
       min_page_scale_factor_(1.f),
       max_page_scale_factor_(1.f),
       has_gpu_rasterization_trigger_(false),
       content_is_suitable_for_gpu_rasterization_(true),
       gpu_rasterization_histogram_recorded_(false),
       background_color_(SK_ColorWHITE),
       has_transparent_background_(false),
       partial_texture_update_requests_(0),
       did_complete_scale_animation_(false),
       in_paint_layer_contents_(false),
-      total_frames_used_for_lcd_text_metrics_(0),
       id_(s_layer_tree_host_sequence_number.GetNext() + 1),
       next_commit_forces_redraw_(false),
       shared_bitmap_manager_(shared_bitmap_manager),
       gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
       surface_id_namespace_(0u),
       next_surface_sequence_(1u) {
   if (settings_.accelerated_animation_enabled)
     animation_registrar_ = AnimationRegistrar::Create();
   rendering_stats_instrumentation_->set_record_rendering_stats(
       debug_state_.RecordRenderingStats());
@@ skipping 655 matching lines @@
                           content_is_suitable_for_gpu_rasterization_);
     // Record how many pages actually get gpu rasterization when enabled.
     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationUsed",
                           (has_gpu_rasterization_trigger_ &&
                            content_is_suitable_for_gpu_rasterization_));
   }
 
   gpu_rasterization_histogram_recorded_ = true;
 }
 
-void LayerTreeHost::CalculateLCDTextMetricsCallback(Layer* layer) {
-  if (!layer->SupportsLCDText())
-    return;
-
-  lcd_text_metrics_.total_num_cc_layers++;
-  if (layer->draw_properties().can_use_lcd_text) {
-    lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text++;
-    if (layer->contents_opaque())
-      lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text++;
-  }
-}
-
 bool LayerTreeHost::UsingSharedMemoryResources() {
   return GetRendererCapabilities().using_shared_memory_resources;
 }
 
 bool LayerTreeHost::UpdateLayers(Layer* root_layer,
                                  ResourceUpdateQueue* queue) {
   TRACE_EVENT1("cc", "LayerTreeHost::UpdateLayers",
                "source_frame_number", source_frame_number());
 
   RenderSurfaceLayerList update_list;
@@ skipping 20 matching lines @@
         root_layer, device_viewport_size(), gfx::Transform(),
         device_scale_factor_, page_scale_factor_, page_scale_layer,
         elastic_overscroll_, overscroll_elasticity_layer_.get(),
         GetRendererCapabilities().max_texture_size, settings_.can_use_lcd_text,
         settings_.layers_always_allowed_lcd_text,
         can_render_to_separate_surface,
         settings_.layer_transforms_should_scale_layer_contents,
         settings_.verify_property_trees, &update_list,
         render_surface_layer_list_id);
     LayerTreeHostCommon::CalculateDrawProperties(&inputs);
-
-    if (total_frames_used_for_lcd_text_metrics_ <=
-        kTotalFramesToUseForLCDTextMetrics) {
-      LayerTreeHostCommon::CallFunctionForSubtree(
-          root_layer,
-          base::Bind(&LayerTreeHost::CalculateLCDTextMetricsCallback,
-                     base::Unretained(this)));
-      total_frames_used_for_lcd_text_metrics_++;
-    }
-
-    if (total_frames_used_for_lcd_text_metrics_ ==
-        kTotalFramesToUseForLCDTextMetrics) {
-      total_frames_used_for_lcd_text_metrics_++;
-
-      UMA_HISTOGRAM_PERCENTAGE(

[danakj, 2015/02/18 01:24:10]

Are these not being used anymore?

-          "Renderer4.LCDText.PercentageOfCandidateLayers",
-          lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text * 100.0 /
-          lcd_text_metrics_.total_num_cc_layers);
-      UMA_HISTOGRAM_PERCENTAGE(
-          "Renderer4.LCDText.PercentageOfAALayers",
-          lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text * 100.0 /
-          lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text);
-    }
   }
 
   // Reset partial texture update requests.
   partial_texture_update_requests_ = 0;
 
   bool did_paint_content = false;
   bool need_more_updates = false;
   PaintLayerContents(
       update_list, queue, &did_paint_content, &need_more_updates);
   if (need_more_updates) {
@@ skipping 473 matching lines @@
     bool children_need_begin_frames) const {
   proxy_->SetChildrenNeedBeginFrames(children_need_begin_frames);
 }
 
 void LayerTreeHost::SendBeginFramesToChildren(
     const BeginFrameArgs& args) const {
   client_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc