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

cc/surfaces/display.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/display.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 265 matching lines @@
                                      stored_latency_info_.begin(),
                                      stored_latency_info_.end());
   stored_latency_info_.clear();
   bool have_copy_requests = false;
   for (const auto& pass : frame.render_pass_list) {
     have_copy_requests |= !pass->copy_requests.empty();
   }
 
   gfx::Size surface_size;
   bool have_damage = false;
-  if (!frame.render_pass_list.empty()) {
-    RenderPass& last_render_pass = *frame.render_pass_list.back();
-    if (last_render_pass.output_rect.size() != current_surface_size_ &&
-        last_render_pass.damage_rect == last_render_pass.output_rect &&
-        !current_surface_size_.IsEmpty()) {
-      // Resize the output rect to the current surface size so that we won't
-      // skip the draw and so that the GL swap won't stretch the output.
-      last_render_pass.output_rect.set_size(current_surface_size_);
-      last_render_pass.damage_rect = last_render_pass.output_rect;
-    }
-    surface_size = last_render_pass.output_rect.size();
-    have_damage = !last_render_pass.damage_rect.size().IsEmpty();
+  RenderPass& last_render_pass = *frame.render_pass_list.back();
+  if (last_render_pass.output_rect.size() != current_surface_size_ &&
+      last_render_pass.damage_rect == last_render_pass.output_rect &&
+      !current_surface_size_.IsEmpty()) {
+    // Resize the output rect to the current surface size so that we won't
+    // skip the draw and so that the GL swap won't stretch the output.
+    last_render_pass.output_rect.set_size(current_surface_size_);
+    last_render_pass.damage_rect = last_render_pass.output_rect;
   }
+  surface_size = last_render_pass.output_rect.size();
+  have_damage = !last_render_pass.damage_rect.size().IsEmpty();
 
   bool size_matches = surface_size == current_surface_size_;
   if (!size_matches)
     TRACE_EVENT_INSTANT0("cc", "Size mismatch.", TRACE_EVENT_SCOPE_THREAD);
 
   bool should_draw = have_copy_requests || (have_damage && size_matches);
 
   // If the surface is suspended then the resources to be used by the draw are
   // likely destroyed.
   if (output_surface_->SurfaceIsSuspendForRecycle()) {
@@ skipping 108 matching lines @@
 const SurfaceId& Display::CurrentSurfaceId() {
   return current_surface_id_;
 }
 
 void Display::ForceImmediateDrawAndSwapIfPossible() {
   if (scheduler_)
     scheduler_->ForceImmediateSwapIfPossible();
 }
 
 }  // namespace cc