cc: Refactor TileTaskWorkerPool.

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 0d35c955c56dfe636114a691dd64a5836ac95d78..cf4cd6a2966175fd4cc0e757163ff6d12856ff18 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -351,16 +351,18 @@ component("cc") {
     "quads/tile_draw_quad.h",
     "quads/yuv_video_draw_quad.cc",
     "quads/yuv_video_draw_quad.h",
-    "raster/bitmap_tile_task_worker_pool.cc",
-    "raster/bitmap_tile_task_worker_pool.h",
+    "raster/bitmap_raster_buffer_provider.cc",
+    "raster/bitmap_raster_buffer_provider.h",
+    "raster/gpu_raster_buffer_provider.cc",
+    "raster/gpu_raster_buffer_provider.h",
     "raster/gpu_rasterizer.cc",
     "raster/gpu_rasterizer.h",
-    "raster/gpu_tile_task_worker_pool.cc",
-    "raster/gpu_tile_task_worker_pool.h",
-    "raster/one_copy_tile_task_worker_pool.cc",
-    "raster/one_copy_tile_task_worker_pool.h",
+    "raster/one_copy_raster_buffer_provider.cc",
+    "raster/one_copy_raster_buffer_provider.h",
     "raster/raster_buffer.cc",
     "raster/raster_buffer.h",
+    "raster/raster_buffer_provider.cc",
+    "raster/raster_buffer_provider.h",
     "raster/scoped_gpu_raster.cc",
     "raster/scoped_gpu_raster.h",
     "raster/single_thread_task_graph_runner.cc",
@@ -381,10 +383,8 @@ component("cc") {
     "raster/texture_compressor_etc1.h",
     "raster/tile_task.cc",
     "raster/tile_task.h",
-    "raster/tile_task_worker_pool.cc",
-    "raster/tile_task_worker_pool.h",
-    "raster/zero_copy_tile_task_worker_pool.cc",
-    "raster/zero_copy_tile_task_worker_pool.h",
+    "raster/zero_copy_raster_buffer_provider.cc",
+    "raster/zero_copy_raster_buffer_provider.h",
     "resources/memory_history.cc",
     "resources/memory_history.h",
     "resources/platform_color.h",
@@ -465,6 +465,8 @@ component("cc") {
     "tiles/tile_manager.h",
     "tiles/tile_priority.cc",
     "tiles/tile_priority.h",
+    "tiles/tile_task_manager.cc",
+    "tiles/tile_task_manager.h",
     "tiles/tiling_set_eviction_queue.cc",
     "tiles/tiling_set_eviction_queue.h",
     "tiles/tiling_set_raster_queue_all.cc",
@@ -618,6 +620,8 @@ source_set("test_support") {
     "test/fake_picture_layer_tiling_client.h",
     "test/fake_proxy.cc",
     "test/fake_proxy.h",
+    "test/fake_raster_buffer_provider.cc",
+    "test/fake_raster_buffer_provider.h",
     "test/fake_raster_source.cc",
     "test/fake_raster_source.h",
     "test/fake_recording_source.cc",
@@ -634,6 +638,8 @@ source_set("test_support") {
     "test/fake_tile_manager.h",
     "test/fake_tile_manager_client.cc",
     "test/fake_tile_manager_client.h",
+    "test/fake_tile_task_manager.cc",
+    "test/fake_tile_task_manager.h",
     "test/fake_ui_resource_layer_tree_host_impl.cc",
     "test/fake_ui_resource_layer_tree_host_impl.h",
     "test/fake_video_frame_provider.cc",
@@ -845,11 +851,11 @@ test("cc_unittests") {
     "quads/draw_polygon_unittest.cc",
     "quads/draw_quad_unittest.cc",
     "quads/render_pass_unittest.cc",
+    "raster/raster_buffer_provider_unittest.cc",
     "raster/scoped_gpu_raster_unittest.cc",
     "raster/single_thread_task_graph_runner_unittest.cc",
     "raster/synchronous_task_graph_runner_unittest.cc",
     "raster/texture_compressor_etc1_unittest.cc",
-    "raster/tile_task_worker_pool_unittest.cc",
     "resources/platform_color_unittest.cc",
     "resources/resource_pool_unittest.cc",
     "resources/resource_provider_unittest.cc",
@@ -963,9 +969,9 @@ test("cc_perftests") {
     "layers/layer_perftest.cc",
     "layers/picture_layer_impl_perftest.cc",
     "quads/draw_quad_perftest.cc",
+    "raster/raster_buffer_provider_perftest.cc",
     "raster/task_graph_runner_perftest.cc",
     "raster/texture_compressor_perftest.cc",
-    "raster/tile_task_worker_pool_perftest.cc",
     "surfaces/surface_aggregator_perftest.cc",
     "test/cc_test_suite.cc",
     "test/run_all_perftests.cc",