Add flag for drawing layers to screen with Ganesh

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index bfa0a696c4b304cfc41f51d99495db5467998b68..707f8b4876b229413e9f32c14ba84e1b2d60c684 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -11,7 +11,6 @@
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
-#include "cc/debug/debug_colors.h"
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/raster_worker_pool.h"
@@ -855,7 +854,7 @@ void TileManager::RunAnalyzeTask(
   if (metadata.prediction_benchmarking) {
     SkDevice device(SkBitmap::kARGB_8888_Config, rect.width(), rect.height());
     SkCanvas canvas(&device);
-    picture_pile->Raster(&canvas, rect, contents_scale, NULL);
+    picture_pile->RasterToBitmap(&canvas, rect, contents_scale, NULL);
 
     const SkBitmap bitmap = device.accessBitmap(false);
     DCHECK_EQ(bitmap.rowBytes(),
@@ -908,14 +907,9 @@ void TileManager::RunRasterTask(
   SkDevice device(bitmap);
   SkCanvas canvas(&device);
 
-#ifndef NDEBUG
-  // Any non-painted areas will be left in this color.
-  canvas.clear(DebugColors::NonPaintedFillColor());
-#endif  // NDEBUG
-
   if (stats_instrumentation->record_rendering_stats()) {
     PicturePileImpl::RasterStats raster_stats;
-    picture_pile->Raster(&canvas, rect, contents_scale, &raster_stats);
+    picture_pile->RasterToBitmap(&canvas, rect, contents_scale, &raster_stats);
     stats_instrumentation->AddRaster(
         raster_stats.total_rasterize_time,
         raster_stats.best_rasterize_time,
@@ -929,7 +923,7 @@ void TileManager::RunRasterTask(
         100000,
         100);
   } else {
-    picture_pile->Raster(&canvas, rect, contents_scale, NULL);
+    picture_pile->RasterToBitmap(&canvas, rect, contents_scale, NULL);
   }
 }