GPU context creation code duplication cleanup

content/common/gpu/client/webgraphicscontext3d_command_buffer_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/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 167 matching lines @@
     bool onscreen, WebGraphicsContext3DCommandBufferImpl* share_context) {
   if (!host_.get())
     return false;
 
   CommandBufferProxyImpl* share_group_command_buffer = NULL;
 
   if (share_context) {
     share_group_command_buffer = share_context->command_buffer_.get();
   }
 
+  ::gpu::gles2::ContextCreationAttribHelper attribs_for_gles2;
+  ConvertAttributes(attributes_, &attribs_for_gles2);
+  attribs_for_gles2.lose_context_when_out_of_memory_ =
+      lose_context_when_out_of_memory_;
+  attribs_for_gles2.bind_generates_resource_ = false;
+  DCHECK(attribs_for_gles2.buffer_preserved_);
   std::vector<int32> attribs;
-  attribs.push_back(ALPHA_SIZE);
-  attribs.push_back(attributes_.alpha ? 8 : 0);
-  attribs.push_back(DEPTH_SIZE);
-  attribs.push_back(attributes_.depth ? 24 : 0);
-  attribs.push_back(STENCIL_SIZE);
-  attribs.push_back(attributes_.stencil ? 8 : 0);
-  attribs.push_back(SAMPLES);
-  attribs.push_back(attributes_.antialias ? 4 : 0);
-  attribs.push_back(SAMPLE_BUFFERS);
-  attribs.push_back(attributes_.antialias ? 1 : 0);
-  attribs.push_back(FAIL_IF_MAJOR_PERF_CAVEAT);
-  attribs.push_back(attributes_.failIfMajorPerformanceCaveat ? 1 : 0);
-  attribs.push_back(LOSE_CONTEXT_WHEN_OUT_OF_MEMORY);
-  attribs.push_back(lose_context_when_out_of_memory_ ? 1 : 0);
-  attribs.push_back(BIND_GENERATES_RESOURCES);
-  attribs.push_back(0);
-  attribs.push_back(NONE);
+  attribs_for_gles2.Serialize(&attribs);
 
   // Create a proxy to a command buffer in the GPU process.
   if (onscreen) {
     command_buffer_.reset(host_->CreateViewCommandBuffer(
         surface_id_,
         share_group_command_buffer,
         attribs,
         active_url_,
         gpu_preference_));
   } else {
@@ skipping 217 matching lines @@
   share_group_->RemoveAllContexts();
 
   DCHECK(host_.get());
   {
     base::AutoLock lock(g_default_share_groups_lock.Get());
     g_default_share_groups.Get().erase(host_.get());
   }
 }
 
 }  // namespace content