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..4646225cfd091d7da2c02f6c64b67e67bf1933aa 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -15,6 +15,8 @@ class FakeRasterWorkerPool : public RasterWorkerPool {
   FakeRasterWorkerPool() : RasterWorkerPool(NULL, 1) {}
 
   virtual void ScheduleTasks(RasterTask::Queue* queue) OVERRIDE {}
+  virtual void OnRasterTasksFinished() OVERRIDE {}
+  virtual void OnRasterTasksRequiredForActivationFinished() OVERRIDE {}
 };
 
 }  // namespace
@@ -37,4 +39,15 @@ 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