cc: Implement shared worker contexts. (v1)

cc/raster/tile_task_worker_pool_perftest.cc

Index: cc/raster/tile_task_worker_pool_perftest.cc
diff --git a/cc/raster/tile_task_worker_pool_perftest.cc b/cc/raster/tile_task_worker_pool_perftest.cc
index 12b7464883603a01a2a36b37b04f818724de8c7b..67def5a7dfd62ae3706edb545b0c1c97053d1556 100644
--- a/cc/raster/tile_task_worker_pool_perftest.cc
+++ b/cc/raster/tile_task_worker_pool_perftest.cc
@@ -98,10 +98,11 @@ class PerfContextProvider : public ContextProvider {
   base::Lock* GetLock() override { return &context_lock_; }
   void VerifyContexts() override {}
   void DeleteCachedResources() override {}
-  bool DestroyedOnMainThread() override { return false; }
+  bool HasBeenLostOnMainThread() override { return false; }
   void SetLostContextCallback(const LostContextCallback& cb) override {}
   void SetMemoryPolicyChangedCallback(
       const MemoryPolicyChangedCallback& cb) override {}
+  bool HasBeenDestroyed() override { return false; }
 
  private:
   ~PerfContextProvider() override {}