Update from https://crrev.com/303153

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 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 <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/synchronization/lock.h"
@@ skipping 4150 matching lines @@
   void InitializeSettings(LayerTreeSettings* settings) override {
     settings->impl_side_painting = true;
     settings->use_zero_copy = false;
     settings->use_one_copy = false;
   }
 
   scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface(
       bool fallback) override {
     scoped_refptr<TestContextProvider> context_provider =
         TestContextProvider::Create();
-    context_provider->SetMaxTransferBufferUsageBytes(1024 * 1024);
+    context_provider->SetMaxTransferBufferUsageBytes(512 * 512);
     if (delegating_renderer())
       return FakeOutputSurface::CreateDelegating3d(context_provider);
     else
       return FakeOutputSurface::Create3d(context_provider);
   }
 
   void SetupTree() override {
     client_.set_fill_with_nonsolid_color(true);
     scoped_refptr<FakePictureLayer> root_layer =
         FakePictureLayer::Create(&client_);
-    root_layer->SetBounds(gfx::Size(6000, 6000));
+    root_layer->SetBounds(gfx::Size(1024, 1024));
     root_layer->SetIsDrawable(true);
 
     layer_tree_host()->SetRootLayer(root_layer);
     LayerTreeHostTest::SetupTree();
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DidActivateTreeOnThread(LayerTreeHostImpl* impl) override {
     TestWebGraphicsContext3D* context = TestContext();
 
     // Expect that the transfer buffer memory used is equal to the
     // MaxTransferBufferUsageBytes value set in CreateOutputSurface.
-    EXPECT_EQ(1024 * 1024u, context->max_used_transfer_buffer_usage_bytes());
+    EXPECT_EQ(512 * 512u, context->max_used_transfer_buffer_usage_bytes());
     EndTest();
   }
 
   void AfterTest() override {}
 
  private:
   FakeContentLayerClient client_;
 };
 
 // Impl-side painting is a multi-threaded compositor feature.
@@ skipping 968 matching lines @@
   void AfterTest() override {
     EXPECT_TRUE(deltas_sent_to_client_);
   }
 
   ScrollAndScaleSet info_;
   bool deltas_sent_to_client_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostAcceptsDeltasFromImplWithoutRootLayer);
 }  // namespace cc