HUD: Show first paint invalidation in red

cc/layers/picture_layer_impl.cc

 // Copyright 2012 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/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
 #include "base/debug/trace_event_argument.h"
 #include "base/time/time.h"
 #include "cc/base/math_util.h"
 #include "cc/base/util.h"
 #include "cc/debug/debug_colors.h"
+#include "cc/debug/debug_rect_history.h"
 #include "cc/debug/micro_benchmark_impl.h"
 #include "cc/debug/traced_value.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/solid_color_layer_impl.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/picture_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/tile_draw_quad.h"
@@ skipping 110 matching lines @@
   layer_impl->raster_source_scale_ = raster_source_scale_;
   layer_impl->raster_contents_scale_ = raster_contents_scale_;
   layer_impl->low_res_raster_contents_scale_ = low_res_raster_contents_scale_;
   layer_impl->needs_post_commit_initialization_ = false;
 
   // The invalidation on this soon-to-be-recycled layer must be cleared to
   // mirror clearing the invalidation in PictureLayer's version of this function
   // in case push properties is skipped.
   layer_impl->invalidation_.Swap(&invalidation_);
   invalidation_.Clear();
+  layer_impl->debug_invalidation_.swap(debug_invalidation_);
+  debug_invalidation_.clear();
   needs_post_commit_initialization_ = true;
 
   // We always need to push properties.
   // See http://crbug.com/303943
   needs_push_properties_ = true;
 }
 
 void PictureLayerImpl::AppendQuads(
     RenderPass* render_pass,
     const OcclusionTracker<LayerImpl>& occlusion_tracker,
@@ skipping 1630 matching lines @@
     case PictureLayerTilingSet::LOWER_THAN_LOW_RES: {
       PictureLayerTilingSet::TilingRange tiling_range = CurrentTilingRange();
       size_t current_tiling_range_offset = current_tiling_ - tiling_range.start;
       return tiling_range.end - 1 - current_tiling_range_offset;
     }
   }
   NOTREACHED();
   return 0;
 }
 
+bool PictureLayerImpl::GetDetailedPaintRects(std::vector<DebugRect>* rects) {
+  rects->insert(
+      rects->end(), debug_invalidation_.begin(), debug_invalidation_.end());
+  debug_invalidation_.clear();
+  return true;
+}
+
 }  // namespace cc