Add AsyncFlush when transferbuffer is > a certain size

gpu/command_buffer/client/gles2_implementation.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
 #include <GLES2/gl2.h>
 
 #include <map>
@@ skipping 125 matching lines @@
     GLint num_compressed_texture_formats;
     GLint num_shader_binary_formats;
   };
 
   // The maxiumum result size from simple GL get commands.
   static const size_t kMaxSizeOfSimpleResult = 16 * sizeof(uint32);  // NOLINT.
 
   // used for testing only. If more things are reseved add them here.
   static const unsigned int kStartingOffset = kMaxSizeOfSimpleResult;
 
+  // Size in bytes to issue async flush for transfer buffer.
+  static const unsigned int kSizeToFlush = 256 * 1024;
+
   // The bucket used for results. Public for testing only.
   static const uint32 kResultBucketId = 1;
 
   // Alignment of allocations.
   static const unsigned int kAlignment = 4;
 
   // GL names for the buffers used to emulate client side buffers.
   static const GLuint kClientSideArrayId = 0xFEDCBA98u;
   static const GLuint kClientSideElementArrayId = 0xFEDCBA99u;
 
@@ skipping 389 matching lines @@
 
 inline bool GLES2Implementation::GetTexParameterivHelper(
     GLenum /* target */, GLenum /* pname */, GLint* /* params */) {
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_