TaskGraphRunner refactor

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 9bd924990c44670553f20a0c0e3c337d0348314a..513f39ed57cabfe6d5573a0b89777f4ad399bb25 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -365,8 +365,14 @@ component("cc") {
     "raster/raster_buffer.h",
     "raster/scoped_gpu_raster.cc",
     "raster/scoped_gpu_raster.h",
+    "raster/single_thread_task_graph_runner.cc",
+    "raster/single_thread_task_graph_runner.h",
+    "raster/synchronous_task_graph_runner.cc",
+    "raster/synchronous_task_graph_runner.h",
     "raster/task_graph_runner.cc",
     "raster/task_graph_runner.h",
+    "raster/task_graph_work_queue.cc",
+    "raster/task_graph_work_queue.h",
     "raster/texture_compressor.cc",
     "raster/texture_compressor.h",
     "raster/texture_compressor_etc1.cc",
@@ -653,6 +659,8 @@ source_set("test_support") {
     "test/surface_aggregator_test_helpers.h",
     "test/surface_hittest_test_helpers.cc",
     "test/surface_hittest_test_helpers.h",
+    "test/task_graph_runner_test_template.cc",
+    "test/task_graph_runner_test_template.h",
     "test/test_context_provider.cc",
     "test/test_context_provider.h",
     "test/test_context_support.cc",
@@ -808,7 +816,8 @@ test("cc_unittests") {
     "quads/draw_quad_unittest.cc",
     "quads/render_pass_unittest.cc",
     "raster/scoped_gpu_raster_unittest.cc",
-    "raster/task_graph_runner_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",