Re-land: cc: Add raster finished signals to RasterWorkerPool.

cc/test/fake_tile_manager.cc

Index: cc/test/fake_tile_manager.cc
diff --git a/cc/test/fake_tile_manager.cc b/cc/test/fake_tile_manager.cc
index 3410799c332ff259be6f51ff967272c17c6f5a6c..15f7e7694636186991c68e02146e8e8070a8b043 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -37,4 +37,15 @@ FakeTileManager::FakeTileManager(TileManagerClient* client,
                   false,
                   NULL,
                   resource_provider->best_texture_format()) {}
+
+void FakeTileManager::ReassignMemoryToOOMTilesRequiredForActivation() {
+  ReassignGpuMemoryToOOMTilesRequiredForActivation();
+}
+
+bool FakeTileManager::HasBeenAssignedMemory(Tile* tile) {
+  return std::find(tiles_that_need_to_be_rasterized().begin(),
+                   tiles_that_need_to_be_rasterized().end(),
+                   tile) != tiles_that_need_to_be_rasterized().end();
 }
+
+}  // namespace cc