cc: Remove OverdrawMetrics and --trace-overdraw flag.

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 40ed7acfe7ab8c8ec84e62440254ceebc2b4839b..f4bfada437edcb82f37eb32196d1fb574d13bcd8 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -20,7 +20,6 @@
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/devtools_instrumentation.h"
-#include "cc/debug/overdraw_metrics.h"
 #include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/input/top_controls_manager.h"
 #include "cc/layers/heads_up_display_layer.h"
@@ -903,8 +902,7 @@ void LayerTreeHost::SetPrioritiesForLayers(
 }
 
 void LayerTreeHost::PrioritizeTextures(
-    const RenderSurfaceLayerList& render_surface_layer_list,
-    OverdrawMetrics* metrics) {
+    const RenderSurfaceLayerList& render_surface_layer_list) {
   if (!contents_texture_manager_)
     return;
 
@@ -916,11 +914,6 @@ void LayerTreeHost::PrioritizeTextures(
   SetPrioritiesForLayers(render_surface_layer_list);
   SetPrioritiesForSurfaces(memory_for_render_surfaces_metric);
 
-  metrics->DidUseContentsTextureMemoryBytes(
-      contents_texture_manager_->MemoryAboveCutoffBytes());
-  metrics->DidUseRenderSurfaceTextureMemoryBytes(
-      memory_for_render_surfaces_metric);
-
   contents_texture_manager_->PrioritizeTextures();
 }
 
@@ -983,17 +976,12 @@ void LayerTreeHost::PaintLayerContents(
     ResourceUpdateQueue* queue,
     bool* did_paint_content,
     bool* need_more_updates) {
-  bool record_metrics_for_frame =
-      settings_.show_overdraw_in_tracing &&
-      base::debug::TraceLog::GetInstance() &&
-      base::debug::TraceLog::GetInstance()->IsEnabled();
   OcclusionTracker<Layer> occlusion_tracker(
-      root_layer_->render_surface()->content_rect(), record_metrics_for_frame);
+      root_layer_->render_surface()->content_rect());
   occlusion_tracker.set_minimum_tracking_size(
       settings_.minimum_occlusion_tracking_size);
 
-  PrioritizeTextures(render_surface_layer_list,
-                     occlusion_tracker.overdraw_metrics());
+  PrioritizeTextures(render_surface_layer_list);
 
   in_paint_layer_contents_ = true;
 
@@ -1020,8 +1008,6 @@ void LayerTreeHost::PaintLayerContents(
   }
 
   in_paint_layer_contents_ = false;
-
-  occlusion_tracker.overdraw_metrics()->RecordMetrics(this);
 }
 
 void LayerTreeHost::ApplyScrollAndScale(const ScrollAndScaleSet& info) {