gpu: Fix a bug in the new ReturnFrontBuffer() path for pepper.

gpu/command_buffer/tests/gl_manager.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 "gpu/command_buffer/tests/gl_manager.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stddef.h>
@@ skipping 167 matching lines @@
 GLManager::Options::Options()
     : size(4, 4),
       sync_point_manager(NULL),
       share_group_manager(NULL),
       share_mailbox_manager(NULL),
       virtual_manager(NULL),
       bind_generates_resource(false),
       lose_context_when_out_of_memory(false),
       context_lost_allowed(false),
       context_type(gles2::CONTEXT_TYPE_OPENGLES2),
-      force_shader_name_hashing(false) {}
+      force_shader_name_hashing(false),
+      multisampled(false) {}
 
 GLManager::GLManager()
     : sync_point_manager_(nullptr),
       context_lost_allowed_(false),
       pause_commands_(false),
       paused_order_num_(0),
       command_buffer_id_(
           CommandBufferId::FromUnsafeValue(g_next_command_buffer_id++)),
       next_fence_sync_release_(1) {
   SetupBaseContext();
@@ skipping 80 matching lines @@
 
   gfx::GpuPreference gpu_preference(gfx::PreferDiscreteGpu);
   gles2::ContextCreationAttribHelper attribs;
   attribs.red_size = 8;
   attribs.green_size = 8;
   attribs.blue_size = 8;
   attribs.alpha_size = 8;
   attribs.depth_size = 16;
   attribs.stencil_size = 8;
   attribs.context_type = options.context_type;
+  attribs.samples = options.multisampled ? 4 : 0;
+  attribs.sample_buffers = options.multisampled ? 1 : 0;
 
   if (!context_group) {
     GpuDriverBugWorkarounds gpu_driver_bug_workaround(&command_line);
     scoped_refptr<gles2::FeatureInfo> feature_info =
         new gles2::FeatureInfo(command_line, gpu_driver_bug_workaround);
     context_group = new gles2::ContextGroup(
         gpu_preferences_, mailbox_manager_.get(), NULL,
         new gpu::gles2::ShaderTranslatorCache(gpu_preferences_),
         new gpu::gles2::FramebufferCompletenessCache, feature_info,
         options.bind_generates_resource);
@@ skipping 324 matching lines @@
 
   // Something went wrong, just run the callback now.
   callback.Run();
 }
 
 bool GLManager::CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) {
   return false;
 }
 
 }  // namespace gpu