Fix Win/Clang components build of cc_unittests

cc/tiles/tile_manager.cc

 // Copyright 2012 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 "cc/tiles/tile_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1006 matching lines @@
   std::unique_ptr<RasterBuffer> raster_buffer =
       raster_buffer_provider_->AcquireBufferForRaster(
           resource, resource_content_id, tile->invalidated_id());
   return make_scoped_refptr(new RasterTaskImpl(
       this, tile, resource, prioritized_tile.raster_source(), playback_settings,
       prioritized_tile.priority().resolution, invalidated_rect,
       prepare_tiles_count_, std::move(raster_buffer), &decode_tasks,
       use_gpu_rasterization_));
 }
 
+void TileManager::ResetSignalsForTesting() {
+  signals_.reset();
+}
+
 void TileManager::OnRasterTaskCompleted(
     std::unique_ptr<RasterBuffer> raster_buffer,
     Tile::Id tile_id,
     Resource* resource,
     bool was_canceled) {
   raster_buffer_provider_->ReleaseBufferForRaster(std::move(raster_buffer));
 
   auto found = tiles_.find(tile_id);
   Tile* tile = nullptr;
   if (found != tiles_.end()) {
@@ skipping 331 matching lines @@
   all_tile_tasks_completed = false;
   did_notify_all_tile_tasks_completed = false;
 }
 
 TileManager::PrioritizedWorkToSchedule::PrioritizedWorkToSchedule() = default;
 TileManager::PrioritizedWorkToSchedule::PrioritizedWorkToSchedule(
     PrioritizedWorkToSchedule&& other) = default;
 TileManager::PrioritizedWorkToSchedule::~PrioritizedWorkToSchedule() = default;
 
 }  // namespace cc