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

cc/surfaces/surface_manager.cc

 // Copyright 2014 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/surfaces/surface_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 480 matching lines @@
 
   // Print the current line for |surface_id|.
   Surface* surface = GetSurfaceForId(surface_id);
   if (surface) {
     *str << surface->surface_id().ToString();
     *str << (surface->destroyed() ? " destroyed" : " live");
 
     if (surface->HasPendingFrame()) {
       // This provides the surface size from the root render pass.
       const CompositorFrame& frame = surface->GetPendingFrame();
-      if (!frame.render_pass_list.empty()) {
-        *str << " pending "
-             << frame.render_pass_list.back()->output_rect.size().ToString();
-      }
+      *str << " pending "
+           << frame.render_pass_list.back()->output_rect.size().ToString();
     }
 
     if (surface->HasActiveFrame()) {
       // This provides the surface size from the root render pass.
       const CompositorFrame& frame = surface->GetActiveFrame();
-      if (!frame.render_pass_list.empty()) {
-        *str << " active "
-             << frame.render_pass_list.back()->output_rect.size().ToString();
-      }
+      *str << " active "
+           << frame.render_pass_list.back()->output_rect.size().ToString();
     }
   } else {
     *str << surface_id;
   }
   *str << "\n";
 
   // If the current surface has references to children, sort children and print
   // references for each child.
   auto iter = parent_to_child_refs_.find(surface_id);
   if (iter != parent_to_child_refs_.end()) {
     std::vector<SurfaceId> children(iter->second.begin(), iter->second.end());
     std::sort(children.begin(), children.end());
 
     for (const SurfaceId& child_id : children)
       SurfaceReferencesToStringImpl(child_id, indent + "  ", str);
   }
 }
 #endif  // DCHECK_IS_ON()
 
 }  // namespace cc