Revert of Pass initial size and GPU preference via context attributes

content/test/layouttest_support.cc

 // Copyright (c) 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 "content/public/test/layouttest_support.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 185 matching lines @@
     attributes.lose_context_when_out_of_memory = true;
     const bool automatic_flushes = false;
     const bool support_locking = false;
 
     scoped_refptr<cc::ContextProvider> display_context_provider(
         new ContextProviderCommandBuffer(
             std::move(gpu_channel), gpu::GPU_STREAM_DEFAULT,
             gpu::GpuStreamPriority::NORMAL, gpu::kNullSurfaceHandle,
             GURL(
                 "chrome://gpu/LayoutTestDependenciesImpl::CreateOutputSurface"),
-            automatic_flushes, support_locking, gpu::SharedMemoryLimits(),
-            attributes, nullptr,
+            gl::PreferIntegratedGpu, automatic_flushes, support_locking,
+            gpu::SharedMemoryLimits(), attributes, nullptr,
             command_buffer_metrics::OFFSCREEN_CONTEXT_FOR_TESTING));
 
     cc::LayerTreeSettings settings =
         RenderWidgetCompositor::GenerateLayerTreeSettings(
             *base::CommandLine::ForCurrentProcess(), deps, 1.f);
 
     return base::MakeUnique<cc::PixelTestDelegatingOutputSurface>(
         std::move(compositor_context_provider),
         std::move(worker_context_provider), std::move(display_context_provider),
         settings.renderer_settings, deps->GetSharedBitmapManager(),
@@ skipping 275 matching lines @@
   return result;
 }
 
 void SchedulerRunIdleTasks(const base::Closure& callback) {
     scheduler::RendererScheduler* scheduler =
         content::RenderThreadImpl::current()->GetRendererScheduler();
     scheduler::RunIdleTasksForTesting(scheduler, callback);
 }
 
 }  // namespace content