Update from https://crrev.com/306655

cc/resources/display_list_recording_source.cc

+// Copyright 2014 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/resources/display_list_recording_source.h"
+
+#include <algorithm>
+
+#include "cc/base/region.h"
+#include "cc/layers/content_layer_client.h"
+#include "cc/resources/display_item_list.h"
+#include "cc/resources/display_list_raster_source.h"
+#include "skia/ext/analysis_canvas.h"
+
+namespace {
+
+// Layout pixel buffer around the visible layer rect to record.  Any base
+// picture that intersects the visible layer rect expanded by this distance
+// will be recorded.
+const int kPixelDistanceToRecord = 8000;
+// We don't perform solid color analysis on images that have more than 10 skia
+// operations.
+const int kOpCountThatIsOkToAnalyze = 10;
+
+}  // namespace
+
+namespace cc {
+
+DisplayListRecordingSource::DisplayListRecordingSource()
+    : slow_down_raster_scale_factor_for_debug_(0),
+      can_use_lcd_text_(true),
+      is_solid_color_(false),
+      solid_color_(SK_ColorTRANSPARENT),
+      pixel_record_distance_(kPixelDistanceToRecord),
+      is_suitable_for_gpu_rasterization_(true) {
+}
+
+DisplayListRecordingSource::~DisplayListRecordingSource() {
+}
+
+bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
+    ContentLayerClient* painter,
+    Region* invalidation,
+    bool can_use_lcd_text,
+    const gfx::Size& layer_size,
+    const gfx::Rect& visible_layer_rect,
+    int frame_number,
+    Picture::RecordingMode recording_mode) {
+  bool updated = false;
+
+  if (size_ != layer_size) {
+    size_ = layer_size;
+    updated = true;
+  }
+
+  if (can_use_lcd_text_ != can_use_lcd_text) {
+    can_use_lcd_text_ = can_use_lcd_text;
+    invalidation->Union(gfx::Rect(GetSize()));
+    updated = true;
+  }
+
+  gfx::Rect old_recorded_viewport = recorded_viewport_;
+  recorded_viewport_ = visible_layer_rect;
+  recorded_viewport_.Inset(-pixel_record_distance_, -pixel_record_distance_);
+  recorded_viewport_.Intersect(gfx::Rect(GetSize()));
+
+  if (recorded_viewport_ != old_recorded_viewport) {
+    // Invalidate newly-exposed and no-longer-exposed areas.
+    Region newly_exposed_region(recorded_viewport_);
+    newly_exposed_region.Subtract(old_recorded_viewport);
+    invalidation->Union(newly_exposed_region);
+
+    Region no_longer_exposed_region(old_recorded_viewport);
+    no_longer_exposed_region.Subtract(recorded_viewport_);
+    invalidation->Union(no_longer_exposed_region);
+
+    updated = true;
+  }
+
+  if (!updated && !invalidation->Intersects(recorded_viewport_))
+    return false;
+
+  // TODO(ajuma): Does repeating this way really makes sense with display lists?
+  // With Blink caching recordings, repeated calls will not cause re-recording.
+  int repeat_count = std::max(1, slow_down_raster_scale_factor_for_debug_);
+  for (int i = 0; i < repeat_count; ++i) {
+    display_list_ = painter->PaintContentsToDisplayList(
+        recorded_viewport_, ContentLayerClient::GRAPHICS_CONTEXT_ENABLED);
+  }
+  is_suitable_for_gpu_rasterization_ =
+      display_list_->IsSuitableForGpuRasterization();
+
+  DetermineIfSolidColor();
+  display_list_->EmitTraceSnapshot();
+  return true;
+}
+
+gfx::Size DisplayListRecordingSource::GetSize() const {
+  return size_;
+}
+
+void DisplayListRecordingSource::SetEmptyBounds() {
+  size_ = gfx::Size();
+  Clear();
+}
+
+void DisplayListRecordingSource::SetMinContentsScale(float min_contents_scale) {
+}
+
+void DisplayListRecordingSource::SetTileGridSize(
+    const gfx::Size& tile_grid_size) {
+}
+
+void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
+  slow_down_raster_scale_factor_for_debug_ = factor;
+}
+
+void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
+  is_suitable_for_gpu_rasterization_ = false;
+}
+
+bool DisplayListRecordingSource::IsSuitableForGpuRasterization() const {
+  return is_suitable_for_gpu_rasterization_;
+}
+
+scoped_refptr<RasterSource> DisplayListRecordingSource::CreateRasterSource()
+    const {
+  return scoped_refptr<RasterSource>(
+      DisplayListRasterSource::CreateFromDisplayListRecordingSource(this));
+}
+
+SkTileGridFactory::TileGridInfo
+DisplayListRecordingSource::GetTileGridInfoForTesting() const {
+  return SkTileGridFactory::TileGridInfo();
+}
+
+void DisplayListRecordingSource::DetermineIfSolidColor() {
+  DCHECK(display_list_.get());
+  is_solid_color_ = false;
+  solid_color_ = SK_ColorTRANSPARENT;
+
+  if (display_list_->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
+    return;
+
+  skia::AnalysisCanvas canvas(recorded_viewport_.width(),
+                              recorded_viewport_.height());
+  canvas.translate(-recorded_viewport_.x(), -recorded_viewport_.y());
+  display_list_->Raster(&canvas, nullptr, 1.f);
+  is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
+}
+
+void DisplayListRecordingSource::Clear() {
+  recorded_viewport_ = gfx::Rect();
+  display_list_ = NULL;
+  is_solid_color_ = false;
+}
+
+}  // namespace cc