Allow one-copy task tile worker pool to use compressed textures.

cc/output/renderer_settings.cc

 // Copyright 2014 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 "cc/output/renderer_settings.h"
 
 #include <limits>
 
 #include "base/logging.h"
 
 namespace cc {
 
 RendererSettings::RendererSettings()
     : allow_antialiasing(true),
       force_antialiasing(false),
       force_blending_with_shaders(false),
       partial_swap_enabled(false),
       finish_rendering_on_resize(false),
       should_clear_root_render_pass(true),
       disable_display_vsync(false),
       delay_releasing_overlay_resources(false),
       refresh_rate(60.0),
       highp_threshold_min(0),
-      use_rgba_4444_textures(false),
       texture_id_allocation_chunk_size(64),
-      use_gpu_memory_buffer_resources(false) {}
+      use_gpu_memory_buffer_resources(false),
+      memory_efficient_format(RGBA_8888),
+      memory_efficient_format_with_alpha(RGBA_8888) {}
 
 RendererSettings::~RendererSettings() {
 }
 
 }  // namespace cc