Revert of Pass initial size and GPU preference via context attributes

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 434 matching lines @@
   attributes.stencil_size = 0;
   attributes.samples = 0;
   attributes.sample_buffers = 0;
   attributes.bind_generates_resource = false;
   attributes.lose_context_when_out_of_memory = true;
   const bool automatic_flushes = false;
   return make_scoped_refptr(new ContextProviderCommandBuffer(
       std::move(gpu_channel_host), stream_id, stream_priority,
       gpu::kNullSurfaceHandle,
       GURL("chrome://gpu/RenderThreadImpl::CreateOffscreenContext"),
-      automatic_flushes, support_locking, limits, attributes, nullptr, type));
+      gl::PreferIntegratedGpu, automatic_flushes, support_locking, limits,
+      attributes, nullptr, type));
 }
 
 }  // namespace
 
 // For measuring memory usage after each task. Behind a command line flag.
 class MemoryObserver : public base::MessageLoop::TaskObserver {
  public:
   MemoryObserver() {}
   ~MemoryObserver() override {}
 
@@ skipping 1432 matching lines @@
   // The compositor context shares resources with the worker context unless
   // the worker is async.
   ContextProviderCommandBuffer* share_context = worker_context_provider.get();
   if (IsAsyncWorkerContextEnabled())
     share_context = nullptr;
 
   scoped_refptr<ContextProviderCommandBuffer> context_provider(
       new ContextProviderCommandBuffer(
           gpu_channel_host, gpu::GPU_STREAM_DEFAULT,
           gpu::GpuStreamPriority::NORMAL, gpu::kNullSurfaceHandle, url,
-          automatic_flushes, support_locking, limits, attributes, share_context,
+          gl::PreferIntegratedGpu, automatic_flushes, support_locking, limits,
+          attributes, share_context,
           command_buffer_metrics::RENDER_COMPOSITOR_CONTEXT));
 
   if (layout_test_deps_) {
     return layout_test_deps_->CreateOutputSurface(
         std::move(gpu_channel_host), std::move(context_provider),
         std::move(worker_context_provider), this);
   }
 
 #if defined(OS_ANDROID)
   if (sync_compositor_message_filter_) {
@@ skipping 307 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content