Raster PictureLayerTiling with fractional translation

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 9916918d96ce14d636b40f0b846acd4fa3b8f952..71e179bacd827b191d2fe0e79bb34ef9ef8fa766 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -23,6 +23,7 @@
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/base/devtools_instrumentation.h"
 #include "cc/base/histograms.h"
+#include "cc/base/scale_translate2d.h"
 #include "cc/debug/traced_value.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/raster/raster_buffer.h"
@@ -98,7 +99,7 @@ class RasterTaskImpl : public TileTask {
         raster_source_(std::move(raster_source)),
         content_rect_(tile->content_rect()),
         invalid_content_rect_(invalidated_rect),
-        raster_scale_(tile->contents_scale()),
+        raster_transform_(tile->raster_transform()),
         playback_settings_(playback_settings),
         tile_resolution_(tile_resolution),
         layer_id_(tile->layer_id()),
@@ -128,7 +129,7 @@ class RasterTaskImpl : public TileTask {
 
     raster_buffer_->Playback(raster_source_.get(), content_rect_,
                              invalid_content_rect_, new_content_id_,
-                             raster_scale_, playback_settings_);
+                             raster_transform_, playback_settings_);
   }
 
   // Overridden from TileTask:
@@ -162,7 +163,7 @@ class RasterTaskImpl : public TileTask {
   scoped_refptr<RasterSource> raster_source_;
   gfx::Rect content_rect_;
   gfx::Rect invalid_content_rect_;
-  float raster_scale_;
+  ScaleTranslate2d raster_transform_;
   RasterSource::PlaybackSettings playback_settings_;
   TileResolution tile_resolution_;
   int layer_id_;
@@ -664,9 +665,11 @@ TileManager::PrioritizedWorkToSchedule TileManager::AssignGpuMemoryToTiles() {
       // canvas which is reset between tiles.
       tile->set_solid_color_analysis_performed(true);
       SkColor color = SK_ColorTRANSPARENT;
+      gfx::RectF layer_rect = tile->raster_transform().TransformRectReverse(
+          gfx::RectF(tile->content_rect()));
       bool is_solid_color =
           prioritized_tile.raster_source()->PerformSolidColorAnalysis(
-              tile->content_rect(), tile->contents_scale(), &color);
+              gfx::ToEnclosingRect(layer_rect), 1.f, &color);
       if (is_solid_color) {
         tile->draw_info().set_solid_color(color);
         client_->NotifyTileStateChanged(tile);
@@ -863,7 +866,8 @@ void TileManager::ScheduleTasks(
     // the CheckerImageTracker as well. See crbug.com/691087.
     std::vector<DrawImage> images;
     prioritized_tile.raster_source()->GetDiscardableImagesInRect(
-        tile->enclosing_layer_rect(), tile->contents_scale(), &images);
+        tile->enclosing_layer_rect(), tile->raster_transform().scale(),
+        &images);
     new_locked_images.insert(new_locked_images.end(), images.begin(),
                              images.end());
   }
@@ -967,7 +971,8 @@ scoped_refptr<TileTask> TileManager::CreateRasterTask(
   images.clear();
   if (!playback_settings.skip_images) {
     prioritized_tile.raster_source()->GetDiscardableImagesInRect(
-        tile->enclosing_layer_rect(), tile->contents_scale(), &images);
+        tile->enclosing_layer_rect(), tile->raster_transform().scale(),
+        &images);
     checker_image_tracker_.FilterImagesForCheckeringForTile(
         &images, &images_to_skip, prioritized_tile.tile()->tiling()->tree());
   }