Fix flaky LayerTreeHostCopyRequestTestDeleteTexture test.

cc/trees/layer_tree_host_unittest_copyrequest.cc

 // Copyright 2013 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 <stddef.h>
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 796 matching lines @@
             display_context_provider_->TestContext3d()->NumTextures();
 
         // Request a copy of the layer. This will use another texture.
         MainThreadTaskRunner()->PostTask(
             FROM_HERE,
             base::Bind(
                 &LayerTreeHostCopyRequestTestDeleteTexture::InsertCopyRequest,
                 base::Unretained(this)));
         break;
       case 1:
+        // Copy requests cause a followup commit and draw without the separate
+        // RenderPass required. This changes the number of active textures. So
+        // wait for that draw before counting textures and proceeding.
+        break;
+      case 2:
         // We did a readback, so there will be a readback texture around now.
         num_textures_after_readback_ =
             display_context_provider_->TestContext3d()->NumTextures();
         EXPECT_LT(num_textures_without_readback_, num_textures_after_readback_);
 
         // Now destroy the CopyOutputResult, releasing the texture inside back
         // to the compositor. Then check the resulting number of allocated
         // textures.
         MainThreadTaskRunner()->PostTask(
             FROM_HERE, base::Bind(&LayerTreeHostCopyRequestTestDeleteTexture::
@@ skipping 464 matching lines @@
   int num_draws_;
   bool copy_happened_;
   bool draw_happened_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostCopyRequestTestMultipleDrawsHiddenCopyRequest);
 
 }  // namespace
 }  // namespace cc