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

cc/test/compositor_frame_helpers.cc

 // Copyright 2017 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/compositor_frame_helpers.h"
 #include "cc/output/compositor_frame.h"
 
 namespace cc {
 namespace test {
 
 CompositorFrame MakeCompositorFrame() {
+  CompositorFrame frame = MakeEmptyCompositorFrame();
+  std::unique_ptr<RenderPass> pass = RenderPass::Create();
+  pass->SetNew(1, gfx::Rect(0, 0, 20, 20), gfx::Rect(), gfx::Transform());
+  frame.render_pass_list.push_back(std::move(pass));
+  return frame;
+}
+
+CompositorFrame MakeEmptyCompositorFrame() {
   CompositorFrame frame;
   frame.metadata.begin_frame_ack.source_id = BeginFrameArgs::kManualSourceId;
   frame.metadata.begin_frame_ack.sequence_number =
       BeginFrameArgs::kStartingFrameNumber;
+  frame.metadata.device_scale_factor = 1;
   return frame;
 }
 
 }  // namespace test
 }  // namespace cc