Remove image_decode_tasks_enabled flag.

cc/tiles/tile_manager_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 <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 2353 matching lines @@
 };
 
 TEST_F(CheckerImagingTileManagerTest,
        NoImageDecodeDependencyForCheckeredTiles) {
   const gfx::Size layer_bounds(512, 512);
   SetupDefaultTrees(layer_bounds);
 
   std::unique_ptr<FakeRecordingSource> recording_source =
       FakeRecordingSource::CreateFilledRecordingSource(layer_bounds);
   recording_source->set_fill_with_nonsolid_color(true);
-  recording_source->SetGenerateDiscardableImagesMetadata(true);
 
   sk_sp<SkImage> image = SkImage::MakeFromGenerator(
       base::MakeUnique<testing::StrictMock<MockImageGenerator>>(
           gfx::Size(512, 512)));
   recording_source->add_draw_image(image, gfx::Point(0, 0));
 
   recording_source->Rerecord();
   scoped_refptr<RasterSource> raster_source =
       RasterSource::CreateFromRecordingSource(recording_source.get(), false);
 
@@ skipping 21 matching lines @@
   base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(host_impl()->tile_manager()->HasScheduledTileTasksForTesting());
 }
 
 TEST_F(CheckerImagingTileManagerTest, BuildsImageDecodeQueueAsExpected) {
   const gfx::Size layer_bounds(900, 900);
 
   std::unique_ptr<FakeRecordingSource> recording_source =
       FakeRecordingSource::CreateFilledRecordingSource(layer_bounds);
   recording_source->set_fill_with_nonsolid_color(true);
-  recording_source->SetGenerateDiscardableImagesMetadata(true);
 
   int dimension = 450;
   sk_sp<SkImage> image1 =
       CreateDiscardableImage(gfx::Size(dimension, dimension));
   sk_sp<SkImage> image2 =
       CreateDiscardableImage(gfx::Size(dimension, dimension));
   sk_sp<SkImage> image3 =
       CreateDiscardableImage(gfx::Size(dimension, dimension));
   recording_source->add_draw_image(image1, gfx::Point(0, 0));
   recording_source->add_draw_image(image2, gfx::Point(600, 0));
@@ skipping 152 matching lines @@
         new_settings, task_runner_provider, task_graph_runner);
   }
 };
 
 TEST_F(CheckerImagingTileManagerMemoryTest, AddsAllNowTilesToImageDecodeQueue) {
   const gfx::Size layer_bounds(900, 1400);
 
   std::unique_ptr<FakeRecordingSource> recording_source =
       FakeRecordingSource::CreateFilledRecordingSource(layer_bounds);
   recording_source->set_fill_with_nonsolid_color(true);
-  recording_source->SetGenerateDiscardableImagesMetadata(true);
 
   int dimension = 450;
   sk_sp<SkImage> image1 =
       CreateDiscardableImage(gfx::Size(dimension, dimension));
   sk_sp<SkImage> image2 =
       CreateDiscardableImage(gfx::Size(dimension, dimension));
   recording_source->add_draw_image(image1, gfx::Point(0, 515));
   recording_source->add_draw_image(image2, gfx::Point(515, 515));
 
   recording_source->Rerecord();
@@ skipping 51 matching lines @@
         EXPECT_TRUE(tile);
       else
         EXPECT_FALSE(tile);
     }
   }
   host_impl()->client()->reset_did_request_impl_side_invalidation();
 }
 
 }  // namespace
 }  // namespace cc