Cache GL's viewport on the GPU command buffer client side.

gpu/command_buffer/common/capabilities.cc

 // Copyright 2013 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/common/capabilities.h"
 
 namespace gpu {
 
 Capabilities::PerStagePrecisions::PerStagePrecisions() {
 }
 
 Capabilities::Capabilities()
     : max_combined_texture_image_units(0),
       max_cube_map_texture_size(0),
       max_fragment_uniform_vectors(0),
       max_renderbuffer_size(0),
       max_texture_image_units(0),
       max_texture_size(0),
       max_varying_vectors(0),
       max_vertex_attribs(0),
       max_vertex_texture_image_units(0),
       max_vertex_uniform_vectors(0),
+      max_viewport_width(0),
+      max_viewport_height(0),
       num_compressed_texture_formats(0),
       num_shader_binary_formats(0),
       bind_generates_resource_chromium(0),
       max_3d_texture_size(0),
       max_array_texture_layers(0),
       max_color_attachments(0),
       max_combined_fragment_uniform_components(0),
       max_combined_uniform_blocks(0),
       max_combined_vertex_uniform_components(0),
       max_copy_texture_chromium_size(0),
@@ skipping 55 matching lines @@
       disable_multisampling_color_mask_usage(false),
       disable_webgl_rgb_multisampling_usage(false),
       chromium_image_rgb_emulation(false),
       emulate_rgb_buffer_with_rgba(false),
       major_version(2),
       minor_version(0) {}
 
 Capabilities::Capabilities(const Capabilities& other) = default;
 
 }  // namespace gpu