cc: GPU rasterize tiles synchronously in PrepareToDraw

cc/resources/tile_manager_perftest.cc

Index: cc/resources/tile_manager_perftest.cc
diff --git a/cc/resources/tile_manager_perftest.cc b/cc/resources/tile_manager_perftest.cc
index 7b096bd261b602e409a7e1deddf775960066bcd4..0c860eeb714ebd1560a1aa26680b2ca4f42b3a23 100644
--- a/cc/resources/tile_manager_perftest.cc
+++ b/cc/resources/tile_manager_perftest.cc
@@ -39,12 +39,24 @@ class FakeRasterizerImpl : public Rasterizer, public RasterizerTaskClient {
   // Overridden from Rasterizer:
   void SetClient(RasterizerClient* client) override {}
   void Shutdown() override {}
+  void RunTasks(RasterTaskQueue* queue) override {
+    for (auto& item : queue->items) {
+      RasterTask* task = item.task;
+
+      task->WillSchedule();
+      task->ScheduleOnOriginThread(this);
+      task->DidSchedule();
+
+      task->WillRun();
+      task->RunOnWorkerThread();
+      task->DidRun();
+
+      completed_tasks_.push_back(task);
+    }
+  }
   void ScheduleTasks(RasterTaskQueue* queue) override {
-    for (RasterTaskQueue::Item::Vector::const_iterator it =
-             queue->items.begin();
-         it != queue->items.end();
-         ++it) {
-      RasterTask* task = it->task;
+    for (auto& item : queue->items) {
+      RasterTask* task = item.task;
 
       task->WillSchedule();
       task->ScheduleOnOriginThread(this);
@@ -54,11 +66,7 @@ class FakeRasterizerImpl : public Rasterizer, public RasterizerTaskClient {
     }
   }
   void CheckForCompletedTasks() override {
-    for (RasterTask::Vector::iterator it = completed_tasks_.begin();
-         it != completed_tasks_.end();
-         ++it) {
-      RasterTask* task = it->get();
-
+    for (auto& task : completed_tasks_) {
       task->WillComplete();
       task->CompleteOnOriginThread(this);
       task->DidComplete();