Remove image_decode_tasks_enabled flag.

cc/raster/raster_source_unittest.cc

 // Copyright 2013 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/raster/raster_source.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 189 matching lines @@
   // Discardable pixel refs are found in the following cells:
   // |---|---|
   // | x | x |
   // |---|---|
   // |   | x |
   // |---|---|
   recording_source->add_draw_image(discardable_image[0][0], gfx::Point(0, 0));
   recording_source->add_draw_image(discardable_image[0][1], gfx::Point(260, 0));
   recording_source->add_draw_image(discardable_image[1][1],
                                    gfx::Point(260, 260));
-  recording_source->SetGenerateDiscardableImagesMetadata(true);
   recording_source->Rerecord();
 
   scoped_refptr<RasterSource> raster =
       RasterSource::CreateFromRecordingSource(recording_source.get(), false);
 
   // Tile sized iterators. These should find only one pixel ref.
   {
     gfx::ColorSpace target_color_space = gfx::ColorSpace::CreateSRGB();
     std::vector<DrawImage> images;
     raster->GetDiscardableImagesInRect(gfx::Rect(0, 0, 256, 256), 1.f,
@@ skipping 365 matching lines @@
   // 3. Draw 4x4 green rects into every corner.
   flags.setColor(SK_ColorGREEN);
   recording_source->add_draw_rect_with_flags(gfx::Rect(0, 0, 4, 4), flags);
   recording_source->add_draw_rect_with_flags(
       gfx::Rect(size.width() - 4, 0, 4, 4), flags);
   recording_source->add_draw_rect_with_flags(
       gfx::Rect(0, size.height() - 4, 4, 4), flags);
   recording_source->add_draw_rect_with_flags(
       gfx::Rect(size.width() - 4, size.height() - 4, 4, 4), flags);
 
-  recording_source->SetGenerateDiscardableImagesMetadata(true);
   recording_source->Rerecord();
 
   bool can_use_lcd = true;
   scoped_refptr<RasterSource> raster_source =
       recording_source->CreateRasterSource(can_use_lcd);
   SoftwareImageDecodeCache controller(
       ResourceFormat::RGBA_8888,
       LayerTreeSettings().decoded_image_working_set_budget_bytes);
   raster_source->set_image_decode_cache(&controller);
 
@@ skipping 14 matching lines @@
   EXPECT_EQ(SK_ColorGREEN, bitmap.getColor(0, 24));
   EXPECT_EQ(SK_ColorGREEN, bitmap.getColor(49, 24));
   for (int x = 0; x < 49; ++x)
     EXPECT_EQ(SK_ColorRED, bitmap.getColor(x, 12));
   for (int y = 0; y < 24; ++y)
     EXPECT_EQ(SK_ColorRED, bitmap.getColor(24, y));
 }
 
 }  // namespace
 }  // namespace cc