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

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 56bca4f8028dd8b8cb4d045e66f3a20a848102e8..426927aaaba8b18b75a68fdc0c77979e39d026fd 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -133,7 +133,6 @@ LayerTreeHost::LayerTreeHost(
       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),
@@ -813,18 +812,6 @@ void LayerTreeHost::RecordGpuRasterizationHistogram() {
   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;
 }
@@ -865,29 +852,6 @@ bool LayerTreeHost::UpdateLayers(Layer* root_layer,
         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(
-          "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.