cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

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 77b9b0dfbcf2d46359d3ad824ee22dc280a5e615..2573a3cdf7f5fbf0ee336290285e31b8fe267e84 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -26,22 +26,16 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
   void ScheduleTasks(TaskGraph* graph) override {
     for (const auto& node : graph->nodes) {
       RasterTask* task = static_cast<RasterTask*>(node.task);
-
-      task->WillSchedule();
-      task->ScheduleOnOriginThread(this);
-      task->DidSchedule();
-
       completed_tasks_.push_back(task);
     }
   }
-  void CheckForCompletedTasks() override {
+  void CollectCompletedTasks(Task::Vector* completed_tasks) override {
+    // TODO(prashant.n): Modify the function definition to make it analogous
+    // with other overridden definitions of CollectCompletedTasks.
     for (RasterTask::Vector::iterator it = completed_tasks_.begin();
          it != completed_tasks_.end();
          ++it) {
       RasterTask* task = it->get();
-
-      task->WillComplete();
-      task->CompleteOnOriginThread(this);
       task->DidComplete();
     }
     completed_tasks_.clear();
@@ -53,6 +47,8 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
     return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
   }
 
+  TileTaskClient* AsTileTaskClient() override { return this; }
+
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource,