Don't submit frames with no render passes in cc tests

cc/test/fake_compositor_frame_sink.h

 // 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.
 
 #ifndef CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_
 #define CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
@@ skipping 58 matching lines @@
   CompositorFrame* last_sent_frame() { return last_sent_frame_.get(); }
   size_t num_sent_frames() { return num_sent_frames_; }
 
   CompositorFrameSinkClient* client() { return client_; }
 
   const TransferableResourceArray& resources_held_by_parent() {
     return resources_held_by_parent_;
   }
 
   gfx::Rect last_swap_rect() const {
-    DCHECK(last_swap_rect_valid_);
     return last_swap_rect_;
   }
 
   void ReturnResourcesHeldByParent();
 
  protected:
   FakeCompositorFrameSink(
       scoped_refptr<ContextProvider> context_provider,
       scoped_refptr<ContextProvider> worker_context_provider);
 
   TestGpuMemoryBufferManager test_gpu_memory_buffer_manager_;
   TestSharedBitmapManager test_shared_bitmap_manager_;
 
   std::unique_ptr<CompositorFrame> last_sent_frame_;
   size_t num_sent_frames_ = 0;
   TransferableResourceArray resources_held_by_parent_;
-  bool last_swap_rect_valid_ = false;
   gfx::Rect last_swap_rect_;
 
  private:
   void DidReceiveCompositorFrameAck();
 
   std::unique_ptr<BeginFrameSource> begin_frame_source_;
   base::WeakPtrFactory<FakeCompositorFrameSink> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_