cc: Single-threaded impl-side painting for unit tests

cc/trees/layer_tree_host_unittest_context.cc

 // 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "base/basictypes.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
@@ skipping 89 matching lines @@
     if (delegating_renderer())
       return FakeOutputSurface::CreateDelegating3d(context3d.Pass());
     else
       return FakeOutputSurface::Create3d(context3d.Pass());
   }
 
   virtual DrawResult PrepareToDrawOnThread(
       LayerTreeHostImpl* host_impl,
       LayerTreeHostImpl::FrameData* frame,
       DrawResult draw_result) override {
+    if (draw_result == DRAW_ABORTED_MISSING_HIGH_RES_CONTENT) {
+      // Only valid for single-threaded impl-side painting, which activates
+      // immediately and will try to draw again when content has finished.
+      DCHECK(!host_impl->proxy()->HasImplThread());
+      DCHECK(layer_tree_host()->settings().impl_side_painting);
+      return draw_result;
+    }
     EXPECT_EQ(DRAW_SUCCESS, draw_result);
     if (!times_to_lose_during_draw_)
       return draw_result;
 
     --times_to_lose_during_draw_;
     LoseContext();
 
     times_to_fail_create_ = times_to_fail_recreate_;
     times_to_fail_recreate_ = 0;
 
@@ skipping 1586 matching lines @@
   virtual void AfterTest() override {}
 
   bool deferred_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostContextTestLoseAfterSendingBeginMainFrame);
 
 }  // namespace
 }  // namespace cc