Replaced is_null() with is_valid in SurfaceId and related classes.

cc/test/test_compositor_frame_sink.cc

 // Copyright 2016 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/test/test_compositor_frame_sink.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "cc/output/begin_frame_args.h"
@@ skipping 86 matching lines @@
   display_->renderer_for_testing()->SetEnlargePassTextureAmountForTesting(
       enlarge_pass_texture_amount_);
   display_->SetVisible(true);
   bound_ = true;
   return true;
 }
 
 void TestCompositorFrameSink::DetachFromClient() {
   // Some tests make BindToClient fail on purpose. ^__^
   if (bound_) {
-    if (!delegated_local_frame_id_.is_null())
+    if (delegated_local_frame_id_.is_valid())
       surface_factory_->Destroy(delegated_local_frame_id_);
     surface_manager_->UnregisterSurfaceFactoryClient(frame_sink_id_);
     surface_manager_->InvalidateFrameSinkId(frame_sink_id_);
     bound_ = false;
   }
   display_ = nullptr;
   surface_factory_ = nullptr;
   surface_id_allocator_ = nullptr;
   surface_manager_ = nullptr;
   CompositorFrameSink::DetachFromClient();
 }
 
 void TestCompositorFrameSink::SubmitCompositorFrame(CompositorFrame frame) {
   if (test_client_)
     test_client_->DisplayReceivedCompositorFrame(frame);
 
-  if (delegated_local_frame_id_.is_null()) {
+  if (!delegated_local_frame_id_.is_valid()) {
     delegated_local_frame_id_ = surface_id_allocator_->GenerateId();
     surface_factory_->Create(delegated_local_frame_id_);
   }
   display_->SetSurfaceId(SurfaceId(frame_sink_id_, delegated_local_frame_id_),
                          frame.metadata.device_scale_factor);
 
   gfx::Size frame_size =
       frame.delegated_frame_data->render_pass_list.back()->output_rect.size();
   display_->Resize(frame_size);
 
@@ skipping 29 matching lines @@
 }
 
 void TestCompositorFrameSink::DidDrawCallback() {
   // This is to unthrottle the next frame, not actually a notice that drawing is
   // done.
   client_->DidReceiveCompositorFrameAck();
 }
 
 void TestCompositorFrameSink::ForceReclaimResources() {
   if (capabilities_.can_force_reclaim_resources &&
-      !delegated_local_frame_id_.is_null()) {
+      delegated_local_frame_id_.is_valid()) {
     surface_factory_->SubmitCompositorFrame(delegated_local_frame_id_,
                                             CompositorFrame(),
                                             SurfaceFactory::DrawCallback());
   }
 }
 
 void TestCompositorFrameSink::ReturnResources(
     const ReturnedResourceArray& resources) {
   client_->ReclaimResources(resources);
 }
@@ skipping 13 matching lines @@
   if (test_client_)
     test_client_->DisplayWillDrawAndSwap(will_draw_and_swap, render_passes);
 }
 
 void TestCompositorFrameSink::DisplayDidDrawAndSwap() {
   if (test_client_)
     test_client_->DisplayDidDrawAndSwap();
 }
 
 }  // namespace cc